media: lmedm04: Remove lme2510_kill_urb function.

This function is not necessary and largely a remnant of
dvb-usb workaround and is now controlled by dvb-usb-v2.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>