Version bump to BP1A.250405.006.B1 [core/build_id.mk]

Change-Id: Ib7e80d58d5c18a95ba139b675aaa958a19d26fff
diff --git a/core/build_id.mk b/core/build_id.mk
index 9e14778..d140e2d 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=BP1A.250405.006
+BUILD_ID=BP1A.250405.006.B1