common: cosmetic: CONFIG_BOOTFILE checkpatch compliance

Remove MK_STR from places that consume CONFIG_BOOTFILE to force all definitions to be string literals.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/include/configs/gr_ep2s60.h b/include/configs/gr_ep2s60.h
index 9c5f4df..0cddeee 100644
--- a/include/configs/gr_ep2s60.h
+++ b/include/configs/gr_ep2s60.h
@@ -125,7 +125,7 @@
 #define CONFIG_IPADDR 192.168.0.207
 #define CONFIG_ROOTPATH "/export/rootfs"
 #define CONFIG_HOSTNAME  ml401
-#define CONFIG_BOOTFILE  /uImage
+#define CONFIG_BOOTFILE "/uImage"
 
 #define CONFIG_BOOTCOMMAND	"run flash_self"