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/MPC8610HPCD.h b/include/configs/MPC8610HPCD.h
index c90b69d..aabfb44 100644
--- a/include/configs/MPC8610HPCD.h
+++ b/include/configs/MPC8610HPCD.h
@@ -530,7 +530,7 @@
 #define CONFIG_IPADDR		192.168.1.100
 
 #define CONFIG_HOSTNAME		unknown
-#define CONFIG_ROOTPATH		/opt/nfsroot
+#define CONFIG_ROOTPATH		"/opt/nfsroot"
 #define CONFIG_BOOTFILE		uImage
 #define CONFIG_UBOOTPATH	8610hpcd/u-boot.bin