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/sbc8560.h b/include/configs/sbc8560.h
index f928622..9237bcb 100644
--- a/include/configs/sbc8560.h
+++ b/include/configs/sbc8560.h
@@ -428,7 +428,7 @@
  */
 
 #define CONFIG_HOSTNAME		SBC8560
-#define CONFIG_ROOTPATH		/home/ppc
+#define CONFIG_ROOTPATH		"/home/ppc"
 #define CONFIG_BOOTFILE		uImage
 
 #define	CONFIG_EXTRA_ENV_SETTINGS		\