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/PN62.h b/include/configs/PN62.h
index d562877..dae4577 100644
--- a/include/configs/PN62.h
+++ b/include/configs/PN62.h
@@ -76,7 +76,7 @@
 
 #define CONFIG_SERVERIP		10.0.0.201
 #define CONFIG_IPADDR		10.0.0.200
-#define CONFIG_ROOTPATH		/opt/eldk/ppc_82xx
+#define CONFIG_ROOTPATH		"/opt/eldk/ppc_82xx"
 #define CONFIG_NETMASK		255.255.255.0
 #undef CONFIG_BOOTARGS
 #if 0