Add mjpeg support to camera

[underdoeg]

• Production edit: Follow-up to Add Linux camera support #53666.

I was receiving jpeg decoding errors when trying to use mjpeg with a microsoft lifecam studio webcam on linux. The same code worked fine with a logitech c920 camera though. And the camera works with any other application.
After some investigation, I stumbled upon this blog post https://lightbits.github.io/v4l2_huffman/ that explains that a mjpeg frame does not necessarily has to include the a huffman table which seems to trip up the jpgd library.
This code checks if a table is defined and injects a default one if it is not.

[underdoeg]

This is maybe more of a temporary fix. A better solution might be a jpeg decoder that is able to handle mjpeg frame data.