media: pxa_camera: don't set caps in querycap

The device_caps in struct video_device are already set correctly,
so there is no need to set them in querycap again.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>