This patch remove the function klsi_105_tiocmset which was only
returning -EINVAL. It also removes the function prototype and
the .tiocmset entry in the struct usb_serial_driver.

Verified by compilation only.
Signed-off-by: NPeter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: NJohan Hovold <johan@kernel.org>