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/MPC8560ADS.h b/include/configs/MPC8560ADS.h
index 84a5bcc..b4b312b 100644
--- a/include/configs/MPC8560ADS.h
+++ b/include/configs/MPC8560ADS.h
@@ -480,7 +480,7 @@
 #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