Version bump to BP1A.250505.004.B1 [core/build_id.mk]

Change-Id: Ic87457e057aaa554038b149968125b01cfb50e8e
diff --git a/core/build_id.mk b/core/build_id.mk
index ebf668b..228fc31 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.250505.004
+BUILD_ID=BP1A.250505.004.B1