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/MPC8349EMDS.h b/include/configs/MPC8349EMDS.h
index 0fde1b2..541d2f4 100644
--- a/include/configs/MPC8349EMDS.h
+++ b/include/configs/MPC8349EMDS.h
@@ -697,7 +697,7 @@
 
 #define CONFIG_HOSTNAME		mpc8349emds
 #define CONFIG_ROOTPATH		"/nfsroot/rootfs"
-#define CONFIG_BOOTFILE		uImage
+#define CONFIG_BOOTFILE		"uImage"
 
 #define CONFIG_LOADADDR		800000	/* default location for tftp and bootm */