umb: Introduce the USB umb(4) network driver

This includes the port of a driver originally from OpenBSD, later
ported to NetBSD by the author:

* The umb(4) kernel driver
* The umbctl(8) companion t

umb: Introduce the USB umb(4) network driver

This includes the port of a driver originally from OpenBSD, later
ported to NetBSD by the author:

* The umb(4) kernel driver
* The umbctl(8) companion tool

This driver supports USB network devices implementing the
Mobile Broadband Interface Model (MBIM), often found in modern
(internal) USB models for 4G/LTE mobile broadband access.

It is currently limited to IPv4.

umbctl has to be used to display or set MBIM cellular modem
interface parameters (4G/LTE).

Differential Revision: https://reviews.freebsd.org/D48167
Approved by: adrian, zlei
Sponsored by: FreeBSD Foundation
PR: kern/263783
Submitted by: Pierre Pronchery <khorben@defora.org>

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