Merge tag 'usb-serial-4.17-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git...

Merge tag 'usb-serial-4.17-rc1' of https://git./linux/kernel/git/johan/usb-serial into usb-next

Johan writes:

USB-serial updates for v4.17-rc1

Here are the USB-serial updates for 4.17-rc1, including a
reimplementation of the option-driver interface masking which allows
for a more compact notation when adding new device entries.

Included are also a couple of clean ups and a new ftdi_sio device id.

All but the device-id commit have been in linux-next (without any
reported issues).

Signed-off-by: Johan Hovold <johan@kernel.org>