Define PATH_TO_CLANG_TIDY_SHELL for build/make rules.

* PATH_TO_CLANG_TIDY_SHELL is ${config.ClangTidyShellPath},
  wich is "build/soong/scripts/clang-tidy.sh"

Bug: 110538415
Test: build with WITH_TIDY=1
Change-Id: I27d7be095c998583fa9ad4d705aa1332bd018140

cc/config/global.go

@@ -209,6 +209,7 @@ func init() {
 	})
 	pctx.StaticVariable("ClangPath", "${ClangBase}/${HostPrebuiltTag}/${ClangVersion}")
 	pctx.StaticVariable("ClangBin", "${ClangPath}/bin")
+	pctx.StaticVariable("ClangTidyShellPath", "build/soong/scripts/clang-tidy.sh")
 
 	pctx.VariableFunc("ClangShortVersion", func(ctx android.PackageVarContext) string {
 		if override := ctx.Config().Getenv("LLVM_RELEASE_VERSION"); override != "" {