Add new facility to have multiple active codenames.

Use this to have both L and KKWT.

Change-Id: I78cd5ed2dcffab9e93030184ba6f9eb9a6a3cba5
diff --git a/CleanSpec.mk b/CleanSpec.mk
index c0657e7..e9af8b3 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -241,6 +241,7 @@
 
 # Add ro.product.cpu.abilist{32,64} to build.prop.
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST