media: staging: media: imx: imx7-media-csi: Drop IPU-only formats

The formats specific to the IPUv3 are not supported by the CSI bridge.
Drop them, along with the related code.

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>