uboot: Bump the version number

Change-Id: I8d4a29a0e4812dd041235793220fece44ecd9859
diff --git a/Makefile b/Makefile
index d764394..fabeedc 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@
 
 VERSION = 2017
 PATCHLEVEL = 03
-SUBLEVEL = 2
+SUBLEVEL = 3
 EXTRAVERSION =
 NAME =