Version bump to NGI55D

Change-Id: Ib4a52a0e9dd91feada9a4381567070f56da17d2b
diff --git a/core/build_id.mk b/core/build_id.mk
index e87af5e..2e7a4ad 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=NGI55C
+export BUILD_ID=NGI55D