Frameworks: Annotate trivial @GuardedBy in services/core

Add @GuardedBy for simple functions that require a single lock
and are named XYZLocked.

Derived by errorprone.

Bug: 73000847
Test: m
Test: m javac-check-framework RUN_ERROR_PRONE=true
Change-Id: I6993325b11c71a4ec27c21935fb54a954d95455f
diff --git a/services/core/java/com/android/server/wm/TaskSnapshotPersister.java b/services/core/java/com/android/server/wm/TaskSnapshotPersister.java
index 7b047a8..621bee7 100644
--- a/services/core/java/com/android/server/wm/TaskSnapshotPersister.java
+++ b/services/core/java/com/android/server/wm/TaskSnapshotPersister.java
@@ -281,11 +281,13 @@
             mSnapshot = snapshot;
         }
 
+        @GuardedBy("mLock")
         @Override
         void onQueuedLocked() {
             mStoreQueueItems.offer(this);
         }
 
+        @GuardedBy("mLock")
         @Override
         void onDequeuedLocked() {
             mStoreQueueItems.remove(this);