update uiautomator doclava build to use new location for templates
as per:
https://googleplex-android-review.git.corp.google.com/#/c/1524290/

Change-Id: Ib8588f01005a691474622e6ca81f63234f796f82
diff --git a/cmds/uiautomator/library/Android.mk b/cmds/uiautomator/library/Android.mk
index f932388..e70bd11 100644
--- a/cmds/uiautomator/library/Android.mk
+++ b/cmds/uiautomator/library/Android.mk
@@ -49,7 +49,7 @@
     -api $(uiautomator_internal_api_file) \
     -removedApi $(uiautomator_internal_removed_api_file)
 
-LOCAL_DROIDDOC_CUSTOM_TEMPLATE_DIR := build/tools/droiddoc/templates-sdk
+LOCAL_DROIDDOC_CUSTOM_TEMPLATE_DIR := external/doclava/res/assets/templates-sdk
 LOCAL_UNINSTALLABLE_MODULE := true
 
 LOCAL_MODULE := uiautomator-stubs