Make change and version bump to QQ2A.200501.001.B1

Change-Id: I61b7ab63d9bfa44259e3219903f551df5904505b
diff --git a/core/build_id.mk b/core/build_id.mk
index 9437c00..4a88b8d 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=QQ2A.200501.001
+BUILD_ID=QQ2A.200501.001.B1