M2351: Remove pre-built non-PSA secure image temporarily

This will add back immediately after target renaming is done.

targets/TARGET_NUVOTON/TARGET_M2351/TARGET_NUMAKER_PFM_M2351/TARGET_M23_NS/LICENSE

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-Permissive Binary License
-
-Version 1.0, September 2015
-
-Redistribution.  Redistribution and use in binary form, without
-modification, are permitted provided that the following conditions are
-met:
-
-1) Redistributions must reproduce the above copyright notice and the
-   following disclaimer in the documentation and/or other materials
-   provided with the distribution.
-
-2) Unless to the extent explicitly permitted by law, no reverse
-   engineering, decompilation, or disassembly of this software is
-   permitted.
-
-3) Redistribution as part of a software development kit must include the
-   accompanying file named "DEPENDENCIES" and any dependencies listed in
-   that file.
-
-4) Neither the name of the copyright holder nor the names of its
-   contributors may be used to endorse or promote products derived from
-   this software without specific prior written permission. 
-
-Limited patent license. The copyright holders (and contributors) grant a
-worldwide, non-exclusive, no-charge, royalty-free patent license to
-make, have made, use, offer to sell, sell, import, and otherwise
-transfer this software, where such license applies only to those patent
-claims licensable by the copyright holders (and contributors) that are
-necessarily infringed by this software. This patent license shall not
-apply to any combinations that include this software.  No hardware is
-licensed hereunder.
-
-If you institute patent litigation against any entity (including a
-cross-claim or counterclaim in a lawsuit) alleging that the software
-itself infringes your patent(s), then your rights granted under this
-license shall terminate as of the date such litigation is filed.
-
-DISCLAIMER. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
-CONTRIBUTORS "AS IS." ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
-NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

targets/TARGET_NUVOTON/TARGET_M2351/TARGET_NUMAKER_PFM_M2351/TARGET_M23_NS/README.md

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-# Default secure code for M2351
-
-The M2351 is a TrustZone target that requires two codes: secure and nonsecure. Secure code runs first to set up the secure environment and then brings up the nonsecure code. `NuMaker-mbed-TZ-secure-example.hex` is the default secure code, and `cmse_lib.o` is its accompanying
-secure gateway library, which exports secure functions to nonsecure code. It is built from the [secure code template](https://github.com/OpenNuvoton/NuMaker-mbed-TZ-secure-example). Because secure and nonsecure code may start at an address other than `0x0`, we have chosen `.hex` rather than `.bin` as the output format.
-
-## Hardware partition
-
-On TrustZone targets, you need to partition the hardware first for secure code to run on secure worlds and nonsecure code to run on nonsecure worlds.
-
-The default secure code has the following hardware partition:
-
-- Flash (512KiB in total): 256KiB for secure and 256KiB for nonsecure.
-- SRAM (96KiB in total): 32KiB for secure and 64KiB for nonsecure.
-- Peripherals: Most are configured to nonsecure except the following, which are hardwired or reserved:
-    - **SYS/CLK** hardwired to secure. Accessible to nonsecure through a secure gateway.
-    - **FMC** hardwired to secure. Accessible to nonsecure through a secure gateway.
-    - **WDT** hardwired to secure. Accessible to nonsecure through a secure gateway.
-    - **RTC** configured to secure. Accessible to nonsecure through a secure gateway.
-    - **TMR0/1** hardwired to secure. TMR0 implements secure `us_ticker`, and TMR1 implements secure `lp_ticker`.
-    - **TMR2/3** configured to nonsecure. TMR2 implements nonsecure `us_ticker`, and TMR3 implements nonsecure `lp_ticker`.
-    - **PDMA0** hardwired to secure. Implements secure asynchronous transfer.
-    - **PDMA1** configured to nonsecure. Implements nonsecure asynchronous transfer.
-
-## Flash secure and nonsecure code
-
-To flash secure and nonsecure code on the M2351, drag-and-drop `NuMaker-mbed-TZ-secure-example.hex` first, and then build the user program, for example, [mbed-os-example-blinky.hex](https://github.com/ARMmbed/mbed-os-example-blinky).
-
-## Reference
-
-Please refer to the [secure code template](https://github.com/OpenNuvoton/NuMaker-mbed-TZ-secure-example) for details.