omni: add RRO for custom notification action button background

and cleanup package list

Change-Id: Ifb2c28ffc47cfbf26a3e72afda105ff06cb47d6c
diff --git a/themes/overlays/Android.mk b/themes/overlays/Android.mk
index 210eea7..5feface 100644
--- a/themes/overlays/Android.mk
+++ b/themes/overlays/Android.mk
@@ -37,6 +37,9 @@
 	PrimaryColorDarkBlueOverlay \
 	PrimaryColorDarkGrayOverlay
 
+LOCAL_REQUIRED_MODULES += \
+	NotificationUIOverlay
+
 include $(BUILD_PHONY_PACKAGE)
 include $(CLEAR_VARS)