libcamera: bayer_format: Add support for mbus codes

The existing implementation of the BayerFormat class supports
converting a V4L2PixelFormat to a BayerFormat and vice-versa.

Expand the class by adding support for converting a media bus code
to a BayerFormat instance, by providing a conversion table and a
dedicated static methods.

Do not provide support for converting a BayerFormat to a media bus code
as there's no 1-to-1 mapping between the two.

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

include/libcamera/internal/bayer_format.h

@@ -43,6 +43,7 @@ public:
 	}
 
 	explicit BayerFormat(V4L2PixelFormat v4l2Format);
+	static const BayerFormat &fromMbusCode(unsigned int mbusCode);
 	bool isValid() const { return bitDepth != 0; }
 
 	std::string toString() const;