Version bump to NKG47S

Change-Id: I483577542db668ff4e5555ea3789269715d646b6
diff --git a/core/build_id.mk b/core/build_id.mk
index dd5bbff..8bfe0f8 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=NKG47R
+export BUILD_ID=NKG47S