Version bump to RP1A.190918.002 [core/build_id.mk]

Change-Id: I3103e9064a72ff7ad836614d3e196d0bceb1003d
diff --git a/core/build_id.mk b/core/build_id.mk
index 729cb6b..cee4d4f 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.
 
-BUILD_ID=RP1A.190918.001
+BUILD_ID=RP1A.190918.002