Wrap some services into a SystemService

These services can now be excluded by modifying the list of REQUIRED_SERVICES (TB renamed)

Changed appwidget, devicepolicy, backup and print services.

Change-Id: Id8e2855d5c045cd57bdb02dca9ed75172803bce7
diff --git a/services/Android.mk b/services/Android.mk
index 6ee7fca..8bd7629 100644
--- a/services/Android.mk
+++ b/services/Android.mk
@@ -7,7 +7,7 @@
 LOCAL_SRC_FILES :=
 
 # TODO: Move this to the product makefiles
-REQUIRED_SERVICES := core appwidget backup devicepolicy accessibility print
+REQUIRED_SERVICES := core accessibility appwidget backup devicepolicy print
 
 include $(patsubst %,$(LOCAL_PATH)/%/java/service.mk,$(REQUIRED_SERVICES))