Disable output side crop selections for the decoder.
This fixes the following v4l2-compliance complaint:

		fail: v4l2-test-formats.cpp(1576): IS_DECODER(node)
	test Cropping: FAIL
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>