CMake: Fix Cortex-M33 GCC build

The GCC flag to specify the floating-point hardware (`mfpu`) does not accept
the value `none`. The default value is `auto` which causes the compiler to
select the floating-point and Advanced SIMD instructions based on the
settings of -mcpu and -march. The extension option `+nofp` has been added
to disable floating point instructions.

Author: hugueskamba

tools/cmake/cores/Cortex-M33-NS.cmake

@@ -5,8 +5,7 @@
 if(${MBED_TOOLCHAIN} STREQUAL "GCC_ARM")
     list(APPEND common_options
         "-mthumb"
-        "-mcpu=cortex-m33+nodsp"
-        "-mfpu=none"
+        "-mcpu=cortex-m33+nodsp+nofp"
     )
 elseif(${MBED_TOOLCHAIN} STREQUAL "ARM")
     list(APPEND common_options

tools/cmake/cores/Cortex-M33.cmake

@@ -5,8 +5,7 @@
 if(${MBED_TOOLCHAIN} STREQUAL "GCC_ARM")
     list(APPEND common_options
         "-mthumb"
-        "-mcpu=cortex-m33+nodsp"
-        "-mfpu=none"
+        "-mcpu=cortex-m33+nodsp+nofp"
     )
 elseif(${MBED_TOOLCHAIN} STREQUAL "ARM")
     list(APPEND common_options