Version bump to N2G48G

Change-Id: I86584a13754f01ed5cd6e2e2366737ca35cd6bad
diff --git a/core/build_id.mk b/core/build_id.mk
index b00200f..73812e7 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=N2G48F
+export BUILD_ID=N2G48G