Fix issue #18368417: 5.0 -> 5.1.

Change-Id: Icd7137fe8b1bda1c5aaf170aa7b19a58832144c8
diff --git a/CleanSpec.mk b/CleanSpec.mk
index a4a44ca..6e7c9b0 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -304,6 +304,11 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
 
+# 5.1!
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************