libcamera: ipu3: cio2: Consolidate information about formats

Instead of spreading the mapping between media bus codes and V4L2 FourCC
all over the CIO2 code collect it in a single map and extract the data
from it. This is done in preparation of adding PixelFormat information
to the mix.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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