Merge tag 'usb-serial-4.19-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next

Johan writes:

USB-serial updates for v4.19-rc1

Here are the USB-serial updates for 4.19-rc1, including:

 - gpio support for CP2102N devices
 - improved line-speed handling for cp210x
 - conversion to spin_lock_irqsave() in completion handlers
 - dropped kl5kusb105 support from the kl5kusb105 driver (sic!)

Included are also various lower-priority fixes and clean ups.

All but the final commit have been in linux-next, and with no reported
issues.
Signed-off-by: NJohan Hovold <johan@kernel.org>