Point to sc-mainline-prod branch

Bug: 157501573
Test: repo upload
Change-Id: I9871fa6433febdfa372ea64d2ba0bc1729708301
diff --git a/tools/mainline_hook_project.sh b/tools/mainline_hook_project.sh
index e432000..cb5fc44 100755
--- a/tools/mainline_hook_project.sh
+++ b/tools/mainline_hook_project.sh
@@ -17,7 +17,7 @@
 
 # tunables
 DEV_BRANCH=master
-MAINLINE_BRANCH=mainline-prod
+MAINLINE_BRANCH=sc-mainline-prod
 
 ###
 RED=$(tput setaf 1)