Forward IBinder#dump to CarrierService#dump

This will allow CarrierConfigLoader to dump packages' bound carrier
services as part of bug reports when appropriate.

Bug: 146521742
Test: manual with modified CarrierConfigLoader + dumpsys carrier_config
Change-Id: Ie3aef4216e7a42e5e4cc5ba4a3978b9c4dda50dd

telephony/java/android/service/carrier/CarrierService.java

@@ -25,6 +25,9 @@ import android.os.ResultReceiver;
 import android.telephony.TelephonyRegistryManager;
 import android.util.Log;
 
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
+
 /**
  * A service that exposes carrier-specific functionality to the system.
  * <p>
@@ -156,5 +159,10 @@ public abstract class CarrierService extends Service {
                 result.send(RESULT_ERROR, null);
             }
         }
+
+        @Override
+        protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+            CarrierService.this.dump(fd, pw, args);
+        }
     }
 }