Revert "Revert "RESTRICT AUTOMERGE Set BUILD_ID=SC""

This reverts commit bf70d0ba2a2fb85d761a0b9a0b538806bc8cc95c.

Reason for revert: camera prebuilt fixed to support short BUILD_ID

Bug: 196178071
Change-Id: Idcb57daf31907f1dff615e180790a2f52462b430
Merged-In: I3b7166d28df6d8828f895f839186de78592d259e
diff --git a/core/build_id.mk b/core/build_id.mk
index 2f9c3f3..84429d2 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-BUILD_ID=MASTER
+BUILD_ID=SC