libcamera: imx8-isi: Break-out RAW format selection

The current implementation of the ISI pipeline handler handles
translation of PixelFormat to media bus formats from the sensor
through a centralized map.

As the criteria to select the correct media bus code depend if the
output PixelFormat is a RAW Bayer format or not, start by splitting
the RAW media bus code procedure selection out by adding a method
for such purpose to the ISICameraData class.

Add the function to the ISICameraData and not to the
ISICameraConfiguration because:
- The sensor is a property of CameraData
- The same function will be re-used by the ISIPipelineHandler
  during CameraConfiguration generation.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

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