Remove M codename, version number is 6.0.

Change-Id: I27b477f087b135232f14157123d31da04dee04d7
diff --git a/CleanSpec.mk b/CleanSpec.mk
index c95ae05..7778118 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -364,6 +364,11 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
 
+# 23 is becoming more alive!!!
+$(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
 # ************************************************