Version bump to PPR1.180228.002

Change-Id: Icf1a663ed6ff6e2645bd52cc6af6a170d685246f
diff --git a/core/build_id.mk b/core/build_id.mk
index afd6ae4..7edd206 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=PPR1.180228.001
+export BUILD_ID=PPR1.180228.002