CMake: Fix Cortex M7 flag passed to assembler

tools/cmake/cores/Cortex-M7.cmake

@@ -28,7 +28,7 @@ function(mbed_set_cpu_core_options target mbed_toolchain)
             INTERFACE
                 $<$<COMPILE_LANGUAGE:C>:${compile_options}>
                 $<$<COMPILE_LANGUAGE:CXX>:${compile_options}>
-                $<$<COMPILE_LANGUAGE:ASM>:-mcpu=Cortex-M7.no_fp>
+                $<$<COMPILE_LANGUAGE:ASM>:${compile_options}>
         )
 
         target_link_options(${target}