Move ArbutusSlab to product partition.

Bug: 123701811
Test: make
Change-Id: Id273dce51679a6864f65f030c39c1a42847b342f
diff --git a/Android.mk b/Android.mk
index 1dbedc6..6e67855 100644
--- a/Android.mk
+++ b/Android.mk
@@ -24,7 +24,9 @@
 LOCAL_SRC_FILES := $(LOCAL_MODULE)
 LOCAL_MODULE_CLASS := ETC
 LOCAL_MODULE_TAGS := optional
-LOCAL_MODULE_PATH := $(TARGET_OUT)/fonts
+LOCAL_MODULE_PATH := $(TARGET_OUT_PRODUCT)/fonts
+LOCAL_PRODUCT_MODULE := true
+
 include $(BUILD_PREBUILT)
 
 endif