GRG91B

Change-Id: Ifccdf3b3657b7c0c6d58684cb211d1d7712205ab
diff --git a/core/build_id.mk b/core/build_id.mk
index fe0b59a..664c98c 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -19,4 +19,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=GRG91
+export BUILD_ID=GRG91B