Delete vendor and oem staging directory in "make installclean".

Change-Id: If3211772ea37d4c249c2dc5cc69bd9f48a39b6e3
diff --git a/core/cleanbuild.mk b/core/cleanbuild.mk
index 0932aa1..1bada38 100644
--- a/core/cleanbuild.mk
+++ b/core/cleanbuild.mk
@@ -214,6 +214,8 @@
 	$(PRODUCT_OUT)/recovery \
 	$(PRODUCT_OUT)/root \
 	$(PRODUCT_OUT)/system \
+	$(PRODUCT_OUT)/vendor \
+	$(PRODUCT_OUT)/oem \
 	$(PRODUCT_OUT)/dex_bootjars \
 	$(PRODUCT_OUT)/obj/JAVA_LIBRARIES \
 	$(PRODUCT_OUT)/obj/FAKE \