libcamera: mali-c55: Correct input/output format representation

At present we configure raw streams by looping through the pixel
formats we support and finding one with an associated media bus
format code that the sensor can produce. In the new representation
of raw data from the kernel driver this will not work - the sensor
could produce 8, 10, 12, 14 or 16 bit data and the ISP will force
it to RAW16, which is the only actually supported output.

To fix the issue move to simply finding a pixel format with a bayer
order that matches that of the media bus format produced by the
sensor. If the sensor can produce multiple formats with the same
bayer order use the one with the largest bitdepth.

Finally, remove the claim to support RAW formats of less than 16 bits.

Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>

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