media: rcar-vin: Fix YUYV8_1X16 handling for CSI-2

The YUYV8_1X16 and UYVY8_1X16 formats are treated as 'ITU-R
BT.601/BT.1358 16-bit YCbCr-422 input' (YUV16 - 0x5) in the R-Car VIN
driver and are thus disallowed when capturing frames from the R-Car
CSI-2 interface according to the hardware manual.

As the 1X16 format variants are meant to be used with serial busses they
have to be treated as 'YCbCr-422 8-bit data input' (0x1) when capturing
from CSI-2, which is a valid setting for CSI-2.

Commit 78b3f9d7 ("media: rcar-vin: Add check that input interface
and format are valid") disallowed capturing YUV16 when using the CSI-2
interface. Fix this by using YUV8_BT601 for YCbCr422 when CSI-2 is in
use.

Fixes: 78b3f9d7 ("media: rcar-vin: Add check that input interface and format are valid")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-2-jacopo.mondi@ideasonboard.com


Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>