Version bump to PPB1.181004.002

Change-Id: I1ffc0eba1ade5f882c01a7cf1911910ec52c3c72
diff --git a/core/build_id.mk b/core/build_id.mk
index d008dbb..075bc4c3 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=PPB1.181004.001
+export BUILD_ID=PPB1.181004.002