staging/media: Remove unneeded geometry restrictions from i.MX CSI driver

I don't know what minimal image dimensions are, but 32x32 appears to
be ok according to the docs.
This is needed for small sensors like 80x80 thermal imagers.

Signed-off-by: Krzysztof Halasa <khalasa@piap.pl>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>