refactor: sysroot部件化

close: #I5HF8S
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: I85e5d77620a1cc1895662a8b4aa131598387acaa

en/device-dev/kernel/kernel-small-start-user.md

@@ -48,14 +48,14 @@ Common compilation modes of user-mode programs include:
     Example:
 
     ```
-    clang --target=arm-liteos --sysroot=prebuilts/lite/sysroot -o helloworld helloworld.c
+    clang --target=arm-liteos --sysroot=sysroot -o helloworld helloworld.c
     ```
 
     Before running the  **clang**  command, install the LLVM compiler. For details, see  [Installing LLVM](../quick-start/quickstart-lite-steps-hi3861-setting.md).
 
     **--target=arm-liteos**: specifies the compilation platform, which is arm-liteos.
 
-    **--sysroot=$\{YOUR\_ROOT\_PATH\}/prebuilts/lite/sysroot**: specifies the directory in which you can search for the header file and the dependent standard libraries.
+    **--sysroot=$\{YOUR\_ROOT\_OUT\_PATH\}/sysroot**: specifies the directory in which you can search for the header file and the dependent standard libraries.
 
 
 A user-mode program can be started in either of the following ways:

en/device-dev/porting/porting-thirdparty-cmake.md

@@ -348,7 +348,7 @@ The following steps show how to configure and modify the toolchains for cross-co
     
     #toolchain: follow up-layer, depend on $ohos_build_compiler
     if (ohos_build_compiler == "clang") {
-        CMAKE_TOOLCHAIN_FLAG = "-DOHOS_SYSROOT_PATH=${ohos_root_path}prebuilts/lite/sysroot/"
+        CMAKE_TOOLCHAIN_FLAG = "-DOHOS_SYSROOT_PATH=${root_out_dir}sysroot/"
     } else {
         CMAKE_TOOLCHAIN_FLAG = ""
     }

en/device-dev/porting/porting-thirdparty-makefile.md

@@ -262,9 +262,9 @@ if (ohos_build_thirdparty_migrated_from_fuchisa == true) {
 TEST_ENABLE = "YES"
 
 if (TEST_ENABLE == "YES") {
-    MAKE_COMMAND = "make test OHOS_SYSROOT_PATH=${ohos_root_path}prebuilts/lite/sysroot/"
+    MAKE_COMMAND = "make test OHOS_SYSROOT_PATH=${root_out_dir}sysroot/"
 } else {
-    MAKE_COMMAND = "make OHOS_SYSROOT_PATH=${ohos_root_path}prebuilts/lite/sysroot/"
+    MAKE_COMMAND = "make OHOS_SYSROOT_PATH=${root_out_dir}sysroot/"
 }
 ```
 

zh-cn/device-dev/porting/porting-thirdparty-cmake.md

@@ -219,7 +219,7 @@ CMake方式可通过指定工具链进行交叉编译，修改并编译该库，
    
      #toolchain：follow up-layer，depend on $ohos_build_compiler
      if (ohos_build_compiler == "clang") {
-         CMAKE_TOOLCHAIN_FLAG = "-DOHOS_SYSROOT_PATH=${ohos_root_path}prebuilts/lite/sysroot/"
+         CMAKE_TOOLCHAIN_FLAG = "-DOHOS_SYSROOT_PATH=${root_out_dir}sysroot"
      } else {
          CMAKE_TOOLCHAIN_FLAG = ""
      }

zh-cn/device-dev/porting/porting-thirdparty-makefile.md

@@ -173,9 +173,9 @@ if (ohos_build_thirdparty_migrated_from_fuchisa == true) {
 TEST_ENABLE = "YES"
 
 if (TEST_ENABLE == "YES") {
-    MAKE_COMMAND = "make test OHOS_SYSROOT_PATH=${ohos_root_path}prebuilts/lite/sysroot/"
+    MAKE_COMMAND = "make test OHOS_SYSROOT_PATH=${root_out_dir}sysroot/"
 } else {
-    MAKE_COMMAND = "make OHOS_SYSROOT_PATH=${ohos_root_path}prebuilts/lite/sysroot/"
+    MAKE_COMMAND = "make OHOS_SYSROOT_PATH=${root_out_dir}sysroot/"
 }
 ```