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/mecp5123.h b/include/configs/mecp5123.h
index 19ef254..c0bed27 100644
--- a/include/configs/mecp5123.h
+++ b/include/configs/mecp5123.h
@@ -373,7 +373,7 @@
 
 #define CONFIG_HOSTNAME		mecp512x
 #define CONFIG_BOOTFILE		/tftpboot/mecp512x/uImage
-#define CONFIG_ROOTPATH		/tftpboot/mecp512x/target_root
+#define CONFIG_ROOTPATH		"/tftpboot/mecp512x/target_root"
 
 #define CONFIG_LOADADDR		400000	/* def. location for tftp and bootm */