!14726 remove unused code && update doc

From: @zhujingxuan
Reviewed-by: @wangchengyuan,@zhanghaibo5
Signed-off-by: @wangchengyuan

mindspore/lite/micro/coder/generator/component/const_blocks/cmake_lists.cc

@@ -46,6 +46,7 @@ endif()
 
 if(PLATFORM_ARM32)
   add_compile_definitions(ENABLE_ARM32)
+  add_definitions(-mfloat-abi=softfp -mfpu=neon)
 endif()
 
 set(CMAKE_C_FLAGS "${CMAKE_ENABLE_C99} ${CMAKE_C_FLAGS}")
@@ -123,6 +124,7 @@ endif()
 
 if(PLATFORM_ARM32)
   add_compile_definitions(ENABLE_ARM32)
+  add_definitions(-mfloat-abi=softfp -mfpu=neon)
 endif()
 
 set(CMAKE_C_FLAGS "${CMAKE_ENABLE_C99} ${CMAKE_C_FLAGS}")

mindspore/lite/micro/coder/wrapper/CMakeLists.txt

@@ -6,18 +6,15 @@ else()
     string(REPLACE "-g" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
 endif()
 
-include_directories(${LITE_DIR})
-set(OPERATOR_LIBRARY_PATH ${CMAKE_BINARY_DIR}/operator_library)
-set(HEADER_PATH "${OPERATOR_LIBRARY_PATH}/include")
+if(PLATFORM_ARM64 OR PLATFORM_ARM32)
+    add_compile_definitions(ENABLE_NEON)
+    add_compile_definitions(ENABLE_ARM)
+endif()
 
 if(PLATFORM_ARM64)
     add_compile_definitions(ENABLE_ARM64)
-    add_compile_definitions(ENABLE_NEON)
-    add_compile_definitions(ENABLE_ARM)
 elseif(PLATFORM_ARM32)
     add_compile_definitions(ENABLE_ARM32)
-    add_compile_definitions(ENABLE_NEON)
-    add_compile_definitions(ENABLE_ARM)
 else()
     include(${MICRO_DIR}/cmake/package_cmsis.cmake)
     add_library(cmsis_nn STATIC ${CMSIS_OPS})

mindspore/lite/micro/example/mobilenetv2/README.md

@@ -116,7 +116,7 @@ cmake -DCMAKE_BUILD_TYPE=Release \
 -DANDROID_ABI="armeabi-v7a" \
 -DANDROID_TOOLCHAIN_NAME="clang" \
 -DANDROID_NATIVE_API_LEVEL="19" \
--DMICRO_BUILD_ARM32=ON \
+-DPLATFORM_ARM32=ON \
 -DPKG_PATH={path to}/mindspore-lite-{version}-inference-android-{arch} ..
 make
 ```

mindspore/lite/micro/example/mobilenetv2/mobilenetv2.sh

@@ -138,7 +138,7 @@ else
           -DANDROID_ABI="armeabi-v7a" \
           -DANDROID_TOOLCHAIN_NAME="clang" \
           -DANDROID_NATIVE_API_LEVEL="19" \
-          -DMICRO_BUILD_ARM32=ON \
+          -DPLATFORM_ARM32=ON \
           -DPKG_PATH=${PKG_PATH} ${BENCHMARK_PATH}
 fi
 make