Add PHONY target for host core.art so that is included in default build

Change-Id: I4a2161de73a391b0db953be0e5cd8ec3f79bb9b8
diff --git a/build/Android.oat.mk b/build/Android.oat.mk
index 552411c..cdb7349 100644
--- a/build/Android.oat.mk
+++ b/build/Android.oat.mk
@@ -67,6 +67,12 @@
 
 $(TARGET_CORE_OAT_OUT): $(TARGET_CORE_IMG_OUT)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE := core.art-host
+LOCAL_MODULE_TAGS := optional
+LOCAL_ADDITIONAL_DEPENDENCIES := $(HOST_CORE_IMG_OUT)
+include $(BUILD_PHONY_PACKAGE)
+
 ########################################################################
 # The full system boot classpath
 TARGET_BOOT_JARS := $(subst :, ,$(DEXPREOPT_BOOT_JARS))