Frameworks: Annotate trivial @GuardedBy in services/core

Add @GuardedBy for simple functions that require locks and have a name in
one of the frameworks naming styles for locks ("^.*(Locked|LPw|LPr|L[a-zA-Z]|UL|AL|NL)$").

Derived by errorprone.

Bug: 73000847
Test: m
Change-Id: Ic48bbb2f95c686fb44b6e3169c67fa52d6df80b4
diff --git a/services/core/java/com/android/server/biometrics/face/FaceUserState.java b/services/core/java/com/android/server/biometrics/face/FaceUserState.java
index 7d67c62..e12498e 100644
--- a/services/core/java/com/android/server/biometrics/face/FaceUserState.java
+++ b/services/core/java/com/android/server/biometrics/face/FaceUserState.java
@@ -23,6 +23,7 @@
 import android.util.Slog;
 import android.util.Xml;
 
+import com.android.internal.annotations.GuardedBy;
 import com.android.server.biometrics.common.BiometricUserState;
 
 import libcore.io.IoUtils;
@@ -133,6 +134,7 @@
         }
     }
 
+    @GuardedBy("this")
     @Override
     protected void parseBiometricsLocked(XmlPullParser parser)
             throws IOException, XmlPullParserException {