drivers: video: software driver to turn a display into a video sink

[josuah]

Is your enhancement proposal related to a problem? Please describe.
Connecting a video device to a display is a frequent use-case, and requires boilerplate that can be avoided.

Describe the solution you'd like
Allow plugging a video device directly to a display through a connector/glue software driver interfacing both APIs.

Describe alternatives you've considered

• Put that code in a video subsystem.
• Implement the video API into every display/
• Use RTIO on either APIs so that connecting them is easy.

Additional context
There is a display driver API, there is a video driver API. They both support a different subset of features
but out of the common subset, it is possible to build a generic driver able to connect any supported display to any supported video driver, given the format match.

Depends on:

• drivers: video: "remote-endpoint" does nothing #72311