Version bump to PPR1.180321.002

Change-Id: If21d6a1071c10be52750b84780483f5bd63af25d
diff --git a/core/build_id.mk b/core/build_id.mk
index 1e6fd84..1c7fa83 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=PPR1.180321.001
+export BUILD_ID=PPR1.180321.002