Version bump to QQ2A.200501.001.A2 [core/build_id.mk]

Change-Id: I128074605fb1b199ae5a4a4b8b4e82c7d7c5e148
diff --git a/core/build_id.mk b/core/build_id.mk
index 0a2f598..e216ee9 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=QQ2A.200501.001.A1
+BUILD_ID=QQ2A.200501.001.A2