Version bump to NKG47O

Change-Id: Id4b88f663e29017fe5988159699969f130664da7
diff --git a/core/build_id.mk b/core/build_id.mk
index 419e66c..8940448 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=NKG47N
+export BUILD_ID=NKG47O