Add @SystemApi to MediaSession.FLAG_EXCLUSIVE_GLOBAL_PRIORITY

Bug: 161327893
Test: build successful
Change-Id: Id35295601a61c5f589c5b677c8b41969d76ff7b3
diff --git a/non-updatable-api/module-lib-current.txt b/non-updatable-api/module-lib-current.txt
index 3c0b955..86ac3e4 100644
--- a/non-updatable-api/module-lib-current.txt
+++ b/non-updatable-api/module-lib-current.txt
@@ -39,6 +39,14 @@
 
 }
 
+package android.media.session {
+
+  public final class MediaSession {
+    field public static final int FLAG_EXCLUSIVE_GLOBAL_PRIORITY = 65536; // 0x10000
+  }
+
+}
+
 package android.os {
 
   public class Binder implements android.os.IBinder {