CMake: Add support for ARM's MUSCA B1 target

Add CMakeLists.txt input source file for the target

targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/CMakeLists.txt

@@ -0,0 +1,54 @@
+# Copyright (c) 2020 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+if(${MBED_TOOLCHAIN} STREQUAL "ARM")
+    set(LINKER_FILE device/TOOLCHAIN_ARMC6/musca_ns.sct)
+    set(STARTUP_FILE device/TOOLCHAIN_ARMC6/startup_cmsdk_musca_ns.S)
+elseif(${MBED_TOOLCHAIN} STREQUAL "GCC_ARM")
+    set(LINKER_FILE device/TOOLCHAIN_GCC_ARM/musca_ns.ld)
+    set(STARTUP_FILE device/TOOLCHAIN_GCC_ARM/startup_cmsdk_musca_ns.S)
+endif()
+
+set_property(GLOBAL PROPERTY MBED_TARGET_LINKER_FILE ${CMAKE_CURRENT_SOURCE_DIR}/${LINKER_FILE})
+
+target_include_directories(mbed-core
+    INTERFACE
+        .
+        device
+        device/drivers
+        partition
+)
+
+target_sources(mbed-core
+    INTERFACE
+        gpio_api_ns.c
+        gpio_irq_api.c
+        i2c_api.c
+        lp_ticker.c
+        mbed_serial_platform.c
+        pinmap_ns.c
+        serial_api.c
+        sleep_api.c
+        tfm_ioctl_ns_api.c
+        us_ticker.c
+
+        device/device_definition.c
+        device/system_core_init.c
+
+        device/drivers/gpio_cmsdk_drv.c
+        device/drivers/i2c_ip6510_drv.c
+        device/drivers/musca_b1_scc_drv.c
+        device/drivers/timer_cmsdk_drv.c
+        device/drivers/timer_gp_drv.c
+        device/drivers/uart_pl011_drv.c
+
+        partition/image_macros_preprocessed_ns.c
+        partition/image_macros_preprocessed_s.c
+
+        ${STARTUP_FILE}
+)
+
+target_link_libraries(mbed-core
+    INTERFACE
+        ${CMAKE_CURRENT_SOURCE_DIR}/s_veneers.o
+)