Conditionally set dbus group in init rc.

Change-Id: I9958b56502ee5eecdb3ca279779c6a66774b88f5
diff --git a/Android.mk b/Android.mk
index 6c70e12..84331cb 100644
--- a/Android.mk
+++ b/Android.mk
@@ -352,7 +352,12 @@
 
 endif  # defined(BRILLO)
 
+ifeq ($(BRILLO_USE_DBUS),1)
+LOCAL_INIT_RC := update_engine-dbus.rc
+else  # BRILLO_USE_DBUS != 1
 LOCAL_INIT_RC := update_engine.rc
+endif  # BRILLO_USE_DBUS == 1
+
 include $(BUILD_EXECUTABLE)
 
 ifeq ($(BRILLO_USE_DBUS),1)