Version bump to RD1A.200810.021.B3 [core/build_id.mk]

Change-Id: I334570b732503477d78e0236a9b5258c5edc33b5
diff --git a/core/build_id.mk b/core/build_id.mk
index 13eb429..9b49eb3 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=RD1A.200810.021.B2
+BUILD_ID=RD1A.200810.021.B3