clang: target: Include gcc-m-fpu.cmake file

File gcc-m-fpu.cmake is responsible for determining what should be
passed to -mfpu option. Fortunately GCC and Clang options are compatible
so we can use the file for clang.

The list of supported -mfpu options can be found at
https://github.com/llvm/llvm-project in
llvm/include/llvm/TargetParser/ARMTargetParser.def file.

Signed-off-by: Patryk Duda <pdk@semihalf.com>

cmake/compiler/clang/target.cmake

@@ -20,6 +20,7 @@ find_program(CMAKE_CXX_COMPILER clang++ ${find_program_clang_args})
 
 if(NOT "${ARCH}" STREQUAL "posix")
   include(${ZEPHYR_BASE}/cmake/gcc-m-cpu.cmake)
+  include(${ZEPHYR_BASE}/cmake/gcc-m-fpu.cmake)
 
   if("${ARCH}" STREQUAL "arm")
     list(APPEND TOOLCHAIN_C_FLAGS