media: pvrusb2: Convert queryctrl to query_ext_ctrl

media: pvrusb2: Convert queryctrl to query_ext_ctrl

The driver was missing support for query_ext_ctrl. Instead of adding a
new callback for it, replace the current implementation of queryctrl and
let the ioctl framework emulate the old function.

Most of the fields are identical, so the change is pretty simple.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>