Fix bit-rot in clean-oat targets

Change-Id: If7f1681b34284b16ace6bafdacc2a19a3268480c
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 30d7dcb..026dccb 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -89,6 +89,9 @@
 # ART_TARGET_CLANG := true
 # ART_HOST_CLANG := true
 
+# directory used for dalvik-cache on device
+ART_DALVIK_CACHE_DIR := /data/dalvik-cache
+
 # directory used for gtests on device
 ART_NATIVETEST_DIR := /data/nativetest/art
 ART_NATIVETEST_OUT := $(TARGET_OUT_DATA_NATIVE_TESTS)/art