media: mt9p031: Refactor format handling for different sensor models

Add new structure 'mt9p031_model_info' to encapsulate format codes for
the mt9p031 camera sensor family. This approach enhances code clarity
and maintainability.

Signed-off-by: Tarang Raval <tarang.raval@siliconsignals.io>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>