common: cosmetic: CONFIG_ROOTPATH checkpatch compliance

Remove MK_STR from places that consume CONFIG_ROOTPATH 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/MPC8568MDS.h b/include/configs/MPC8568MDS.h
index 994e7ae..65dd0b2 100644
--- a/include/configs/MPC8568MDS.h
+++ b/include/configs/MPC8568MDS.h
@@ -470,7 +470,7 @@
 #define CONFIG_IPADDR    192.168.1.253
 
 #define CONFIG_HOSTNAME  unknown
-#define CONFIG_ROOTPATH  /nfsroot
+#define CONFIG_ROOTPATH  "/nfsroot"
 #define CONFIG_BOOTFILE  your.uImage
 
 #define CONFIG_SERVERIP  192.168.1.1