chore(build): support liteos_m Kconfig build system

Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: Ic6eb3311b66d68a3400c51617317ece07ff58a0a

BUILD.gn

@@ -32,4 +32,7 @@ group("sysroot") {
   if (ohos_build_compiler == "clang") {
     deps = [ "build" ]
   }
+  if (ohos_kernel_type == "liteos_m" && !ohos_kernel_is_prebuilt) {
+    all_dependent_configs = [ "//kernel/liteos_m:public" ]
+  }
 }