hexagon: update cmake presets to enable fp16 vectors

Author: max-krasnyansky

docs/backend/hexagon/CMakeUserPresets.json

@@ -10,8 +10,8 @@
             "ANDROID_ABI":      "arm64-v8a",
             "ANDROID_PLATFORM": "android-31",
             "CMAKE_TOOLCHAIN_FILE": "$env{ANDROID_NDK_ROOT}/build/cmake/android.toolchain.cmake",
-            "CMAKE_C_FLAGS":   "-march=armv8.7a -fvectorize -ffp-model=fast -fno-finite-math-only -flto -D_GNU_SOURCE",
-            "CMAKE_CXX_FLAGS": "-march=armv8.7a -fvectorize -ffp-model=fast -fno-finite-math-only -flto -D_GNU_SOURCE",
+            "CMAKE_C_FLAGS":   "-march=armv8.7a+fp16 -fvectorize -ffp-model=fast -fno-finite-math-only -flto -D_GNU_SOURCE",
+            "CMAKE_CXX_FLAGS": "-march=armv8.7a+fp16 -fvectorize -ffp-model=fast -fno-finite-math-only -flto -D_GNU_SOURCE",
             "CMAKE_C_FLAGS_RELEASE":          "-O3 -DNDEBUG",
             "CMAKE_CXX_FLAGS_RELEASE":        "-O3 -DNDEBUG",
             "CMAKE_C_FLAGS_RELWITHDEBINFO":   "-O3 -DNDEBUG -g",