point to new repo hooks for mainline uploads

Bug: 157501573
Test: repo upload
Change-Id: Ieddc248caa89a8a9166298b53fee59d4b445c2e0
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index bfd907e..5cb5222 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -1,5 +1,5 @@
 [Hook Scripts]
-mainline_hook = tools/mainline_hook.sh ${PREUPLOAD_COMMIT} "."
+mainline_hook = ${REPO_ROOT}/frameworks/av/tools/mainline_hook_partial.sh ${REPO_ROOT} ${PREUPLOAD_FILES}
 
 [Builtin Hooks]
 clang_format = true