Version bump to NGI55C

Change-Id: I3daa76b6c212f3d5a15d603e7b3460a18d4b60cc
diff --git a/core/build_id.mk b/core/build_id.mk
index dea6f54..e87af5e 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=NGI55B
+export BUILD_ID=NGI55C