ART: Fix clean-oat-host rule

Add vdex to the rule.

Test: m && m clean-oat-host && find $OUT -name '*.vdex'
Change-Id: If04f1006b16a46b7a63955867669b2de44d9fbc8
diff --git a/Android.mk b/Android.mk
index f3ab3c1..0e86188 100644
--- a/Android.mk
+++ b/Android.mk
@@ -42,7 +42,7 @@
 
 .PHONY: clean-oat-host
 clean-oat-host:
-	find $(OUT_DIR) -name "*.oat" -o -name "*.odex" -o -name "*.art" | xargs rm -f
+	find $(OUT_DIR) -name "*.oat" -o -name "*.odex" -o -name "*.art" -o -name '*.vdex' | xargs rm -f
 ifneq ($(TMPDIR),)
 	rm -rf $(TMPDIR)/$(USER)/test-*/dalvik-cache/*
 	rm -rf $(TMPDIR)/android-data/dalvik-cache/*