Version bump to PPR1.180501.002

Change-Id: I50a01127648fb1b42cf0b9767a92c4f0d63ee4ce
diff --git a/core/build_id.mk b/core/build_id.mk
index 3ef50b5..0bb455a 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=PPR1.180501.001
+export BUILD_ID=PPR1.180501.002