add java_api_finder plugin to mainline module Media to generate java APIs used by Media.

Bug: 129294170
Test: m updatable-media RUN_ERROR_PRONE=true |& tee media_error_prone.out
Change-Id: I3cdfe5e00394c6ff7b9c857f63a5e45ac79f8d24
diff --git a/media/Android.bp b/media/Android.bp
index 4f9671f..29064ad 100644
--- a/media/Android.bp
+++ b/media/Android.bp
@@ -33,6 +33,8 @@
         "framework_media_annotation",
         "android_system_stubs_current",
     ],
+
+    plugins: ["java_api_finder"],
 }
 
 filegroup {