Version bump to SD1A.210817.015.A2 [core/build_id.mk]

Change-Id: I1cdfdcf40b8e8ffed9c517268034f972fa37a856
diff --git a/core/build_id.mk b/core/build_id.mk
index 18a340e..4e2f597 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.210817.015.A1
+BUILD_ID=SD1A.210817.015.A2