getFaceDaemon on FaceService's own handler

Do not block SystemServerInitThreadPool

Fixes: 133749191

Test: No observable change
Change-Id: I2b1193b9e6bb92bab9e107756c57bfc0bf924f62
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 0f2b16a..bcd22d4 100644
--- a/services/core/java/com/android/server/biometrics/face/FaceService.java
+++ b/services/core/java/com/android/server/biometrics/face/FaceService.java
@@ -899,7 +899,10 @@
     public void onStart() {
         super.onStart();
         publishBinderService(Context.FACE_SERVICE, new FaceServiceWrapper());
-        SystemServerInitThreadPool.get().submit(this::getFaceDaemon, TAG + ".onStart");
+        // Get the face daemon on FaceService's on thread so SystemServerInitThreadPool isn't
+        // blocked
+        SystemServerInitThreadPool.get().submit(() -> mHandler.post(this::getFaceDaemon),
+                TAG + ".onStart");
     }
 
     @Override