Use v4l2_disable_ioctl() to disable the encoder ioctls
VIDIOC_ENUM_FRAMESIZES, VIDIOC_ENUM_FRAMEINTERVALS, VIDIOC_G_PARM, and
VIDIOC_S_PARM, to fix this v4l2-compliance test failure:

		fail: v4l2-test-formats.cpp(1363): node->is_m2m && !is_stateful_enc
	test VIDIOC_G/S_PARM: FAIL
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>