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/tools/env/fw_env.c b/tools/env/fw_env.c
index f66bd3d..996682e 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -187,7 +187,7 @@
 	"hostname=" MK_STR (CONFIG_HOSTNAME) "\0"
 #endif
 #ifdef	CONFIG_BOOTFILE
-	"bootfile=" MK_STR (CONFIG_BOOTFILE) "\0"
+	"bootfile=" CONFIG_BOOTFILE "\0"
 #endif
 #ifdef	CONFIG_LOADADDR
 	"loadaddr=" MK_STR (CONFIG_LOADADDR) "\0"