Tag @SystemApi to ambient brightness stats API

Bug: 72931803
Test: Manual
Change-Id: I41ac5569e97cc33c57af55a37135a3f7617a2385
(cherry picked from commit 1584fa6f08fd1ea57237f80877848d33a9d70bce)
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 6c2db764..8d9347c 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -3093,8 +3093,8 @@
 
     <!-- Allows an application to collect ambient light stats.
          <p>Not for use by third party applications.</p>
-         TODO: Make a system API
-         @hide -->
+         @hide
+         @SystemApi -->
     <permission android:name="android.permission.ACCESS_AMBIENT_LIGHT_STATS"
         android:protectionLevel="signature|privileged|development" />