Version bump to SD1A.210817.019.B1 [core/build_id.mk]

Change-Id: I31f090c9b6c70b9c9bcfa119d9ba75b152cdf224
diff --git a/core/build_id.mk b/core/build_id.mk
index 2f60026..c925c75 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=SD1A.210817.019
+BUILD_ID=SD1A.210817.019.B1