media: staging: media: imx: imx7-media-csi: Drop unsupported YUV and RGB formats

A large number of formats defined in the pixel_formats array are not
supported, as shown by the switch-case check in
imx7_csi_pad_link_validate(). Drop them.

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>