media: staging: media: imx: imx7-media-csi: Drop IC support from imx7_csi_try_colorimetry()

The imx7_csi_try_colorimetry() function supports the unrelated image
converter hardware as it originates from shared helpers. Drop that.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>