Merge branch 'wan-t7x-fastboot'

Jinjian Song says:

====================
net: wwan: t7xx: Add fastboot interface

Add support for t7xx WWAN device firmware flashing & coredump collection
using fastboot interface.

Using fastboot protocol command through /dev/wwan0fastboot0 WWAN port to
support firmware flashing and coredump collection, userspace get device
mode from /sys/bus/pci/devices/${bdf}/t7xx_mode.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>