Version bump to RD1A.200810.021.B2 [core/build_id.mk]

Change-Id: Ie3fa35c52e68992f2b4c3bb2bee69d484d7b98ad
diff --git a/core/build_id.mk b/core/build_id.mk
index 1854ff2..13eb429 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.B1
+BUILD_ID=RD1A.200810.021.B2