Differentiate MediaController in a process for MediaSession

MediaSession#getCurrentControllerInfo() can have more fine grained
differentiation for multiple MediaController in a package/process

Bug: 79728675
Test: Run CtsMediaTestCases
Change-Id: I81e94736e795ee5e7fbd28cb6cd834cc3a3b8f98
diff --git a/services/core/java/com/android/server/media/MediaSessionService.java b/services/core/java/com/android/server/media/MediaSessionService.java
index a6e9389..6fff367 100644
--- a/services/core/java/com/android/server/media/MediaSessionService.java
+++ b/services/core/java/com/android/server/media/MediaSessionService.java
@@ -1851,7 +1851,7 @@
                     }
                 });
             } else {
-                session.adjustVolume(packageName, pid, uid, asSystemService,
+                session.adjustVolume(packageName, pid, uid, null, asSystemService,
                         direction, flags, true);
             }
         }