[ATfE] Enable locale in libc++ with LLVM-libc

This is required for std::cout. This patch relies on the following:
llvm/llvm-project#156330
llvm/llvm-project#156331

Author: saturn691

arm-software/embedded/arm-runtimes/CMakeLists.txt

@@ -858,7 +858,6 @@ if(ENABLE_CXX_LIBS)
             -DLIBCXX_ENABLE_THREADS=OFF
             -DLIBCXX_ENABLE_WIDE_CHARACTERS=OFF
             -DLIBCXX_ENABLE_FILESYSTEM=OFF
-            -DLIBCXX_ENABLE_LOCALIZATION=OFF
             -DLIBCXX_ENABLE_UNICODE=OFF
             -DLIBUNWIND_ENABLE_THREADS=OFF
             -DLIBCXXABI_ENABLE_EXCEPTIONS=${ENABLE_EXCEPTIONS}