Version bump to N4F27K

Change-Id: I8cce270e5a219e204f3a720d91eaa9cf66f07ac1
diff --git a/core/build_id.mk b/core/build_id.mk
index 4d71a97..ae8b650 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=N4F27J
+export BUILD_ID=N4F27K