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/idmr.h b/include/configs/idmr.h
index 4bc36b9..3fe8f70 100644
--- a/include/configs/idmr.h
+++ b/include/configs/idmr.h
@@ -52,7 +52,7 @@
 #define CONFIG_ETHPRIME
 #define CONFIG_IPADDR		192.168.30.1
 #define CONFIG_SERVERIP		192.168.1.1
-#define CONFIG_ROOTPATH
+#define CONFIG_ROOTPATH		""
 #define CONFIG_GATEWAYIP	192.168.1.1
 #define CONFIG_NETMASK		255.255.0.0
 #define CONFIG_HOSTNAME		idmr