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/dnp5370.h b/include/configs/dnp5370.h
index 4ab48c7..f2f4102 100644
--- a/include/configs/dnp5370.h
+++ b/include/configs/dnp5370.h
@@ -47,7 +47,7 @@
  * Network Settings
  */
 #ifndef __ADSPBF534__
-#define CONFIG_ROOTPATH        /romfs
+#define CONFIG_ROOTPATH        "/romfs"
 
 #define CONFIG_BFIN_MAC         1
 #define CONFIG_PHY_ADDR         0