devlink: include <linux/const.h> for _BITUL

Commit 5d5b4128c4ca ("devlink: introduce flash update overwrite mask")
added a usage of _BITUL to the UAPI <linux/devlink.h> header, but failed
to include the header file where it was defined. It happens that this
does not break any existing kernel include chains because it gets
included through other sources. However, when including the UAPI headers
in a userspace application (such as devlink in iproute2), _BITUL is not
defined.

Fixes: 5d5b4128c4ca ("devlink: introduce flash update overwrite mask")
Signed-off-by: Jacob Keller <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/uapi/linux/devlink.h

···
 #ifndef _UAPI_LINUX_DEVLINK_H_
 #define _UAPI_LINUX_DEVLINK_H_
 
+#include <linux/const.h>
+
 #define DEVLINK_GENL_NAME "devlink"
 #define DEVLINK_GENL_VERSION 0x1
 #define DEVLINK_GENL_MCGRP_CONFIG_NAME "config"