Version bump to QD1A.190821.007.A2 [core/build_id.mk]

Change-Id: I576b60cfd0c07e464d70180efa2494cd29e4be76
diff --git a/core/build_id.mk b/core/build_id.mk
index 2471ab0..fb2fa99 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=QD1A.190821.007.A1
+BUILD_ID=QD1A.190821.007.A2