Version bump to NJH47B

Change-Id: I04b0907a56d5db287bf0426c67bebdcac2680bd4
diff --git a/core/build_id.mk b/core/build_id.mk
index 6581eb2..379f3ff 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=NJH47
+export BUILD_ID=NJH47B