Version bump to QD1A.190731.002 [core/build_id.mk]

Change-Id: I716aea237b8c648766503a91452bd3c32bcc1f69
diff --git a/core/build_id.mk b/core/build_id.mk
index d652466..de1871d 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.190731.001
+BUILD_ID=QD1A.190731.002