Version bump to PD1A.180720.016

Change-Id: I0e2aea2f6d8d8ce014d3dcb3c7a30b00b1c0d067
diff --git a/core/build_id.mk b/core/build_id.mk
index dfaedb7..470c497 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.
 
-export BUILD_ID=PD1A.180720.015
+export BUILD_ID=PD1A.180720.016