DO NOT MERGE Setting build_id to OC-MR1 for oc-mr1-dev

Bug: 63544673
Test: lunching a target shows 'BUILD_ID=OC-MR1'
Change-Id: I0cb3cf6fa27a92a173e40945ad701ccf29bd4d0e
diff --git a/core/build_id.mk b/core/build_id.mk
index 0e8e2cf..ff4d013 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.
 
-export BUILD_ID=MASTER
+export BUILD_ID=OC-MR1