media: imx: imx8mq-mipi-csi2: Remove YUV422 2X8

The 2X8 variants of MEDIA_BUS_FMT_YUYV8_2X8 does not apply to serial
busses.

Drop it and while at it also add the canonical UYVY wire format for
packed YUV422 when transmitted on the CSI-2 serial bus.

Also beautify a little the formats declaration list by putting the
opening curly brace after the comment.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>