Version bump to N2G48E

Change-Id: I5ad7c85c27000fc3d1da019d55b49a1c8d9e0500
diff --git a/core/build_id.mk b/core/build_id.mk
index c6719a4..6f5a6ef 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=N2G48D
+export BUILD_ID=N2G48E