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/sbc8641d.h b/include/configs/sbc8641d.h
index 61551ec..70763e7 100644
--- a/include/configs/sbc8641d.h
+++ b/include/configs/sbc8641d.h
@@ -565,7 +565,7 @@
 #define CONFIG_IPADDR		192.168.0.50
 
 #define CONFIG_HOSTNAME		sbc8641d
-#define CONFIG_ROOTPATH		/opt/eldk/ppc_74xx
+#define CONFIG_ROOTPATH		"/opt/eldk/ppc_74xx"
 #define CONFIG_BOOTFILE		uImage
 
 #define CONFIG_SERVERIP		192.168.0.2