Add WTF when a system server wrapper can't be found

2nd try -- enable it only within the system server.

This is to detect someone trying to access system services too
early during a boot.

Bug: 149406139
Test: Boot with "adb logcat | grep -w SystemServiceRegistry" and make sure no wtf is logged
Change-Id: I64c6776cedaeb534d98621db2955d585e6846b8d

services/java/com/android/server/SystemServer.java

@@ -30,6 +30,7 @@ import android.annotation.StringRes;
 import android.app.ActivityThread;
 import android.app.AppCompatCallbacks;
 import android.app.INotificationManager;
+import android.app.SystemServiceRegistry;
 import android.app.usage.UsageStatsManagerInternal;
 import android.content.ContentResolver;
 import android.content.Context;
@@ -513,6 +514,8 @@ public final class SystemServer {
             Looper.getMainLooper().setSlowLogThresholdMs(
                     SLOW_DISPATCH_THRESHOLD_MS, SLOW_DELIVERY_THRESHOLD_MS);
 
+            SystemServiceRegistry.sEnableServiceNotFoundWtf = true;
+
             // Initialize native services.
             System.loadLibrary("android_servers");