Add much needed logging for face auth challenge / lockout path

Bug: 134834442

Test: Builds, logs seen
Change-Id: I299c36f0fbd1041567a5c13936a8d63aa0d38150
diff --git a/services/core/java/com/android/server/biometrics/face/FaceService.java b/services/core/java/com/android/server/biometrics/face/FaceService.java
index 463a499..edb36d3 100644
--- a/services/core/java/com/android/server/biometrics/face/FaceService.java
+++ b/services/core/java/com/android/server/biometrics/face/FaceService.java
@@ -480,6 +480,8 @@
                 return;
             }
 
+            Slog.d(TAG, "Resetting lockout for user: " + mCurrentUserId);
+
             try {
                 mDaemonWrapper.resetLockout(token);
             } catch (RemoteException e) {