fix: 引入Settings的Module

Settings/aconfig/media_drm/settings_mediadrm_flag_declarations.aconfig

@@ -0,0 +1,9 @@
+package: "com.android.settings.media_drm"
+container: "system"
+
+flag {
+    name: "force_l3_enabled"
+    namespace: "media_drm"
+    description: "Feature flag of forcing L3"
+    bug: "301669353"
+}