Version bump to N2G47[

Change-Id: I66dedd53515a74493073fd5be740fec854b5f912
diff --git a/core/build_id.mk b/core/build_id.mk
index 93a1efb..d0601bd 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=N2G47Z
+export BUILD_ID=N2G47[