common: cosmetic: CONFIG_BOOTFILE checkpatch compliance

Remove MK_STR from places that consume CONFIG_BOOTFILE 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/debris.h b/include/configs/debris.h
index 8473420..60c7c40 100644
--- a/include/configs/debris.h
+++ b/include/configs/debris.h
@@ -93,7 +93,7 @@
 #define CONFIG_HOSTNAME debris
 
 /* bootfile */
-#define CONFIG_BOOTFILE pImage
+#define CONFIG_BOOTFILE "pImage"
 
 /* loadaddr */
 #define CONFIG_LOADADDR 800000