radv: vulkan av1 video decode status

The Khronos Group announced VK_KHR_video_decode_av1 [1], this extension adds AV1 decoding to the Vulkan specification. There is a radv branch [2] and merge request [3]. I did some AV1 work on this in the past, but I need to take some time to see if it has made any progress since. I'll post an ANV update once I figure that out.

This extension is one of the ones I've been wanting for a long time, since having royalty-free codec is something I can actually care about and ship, as opposed to the painful ones. I started working on a MESA extension for this a year or so ago with Lynne from the ffmpeg project and we made great progress with it. We submitted that to Khronos and it has gone through the committee process and been refined and validated amongst the hardware vendors.

I'd like to say thanks to Charlie Turner and Igalia for taking over a lot of the porting to the Khronos extension and fixing up bugs that their CTS development brought up. This is a great feature of having open source drivers, it allows a lot quicker turn around time in bug fixes when devs can fix them themselves!

[1]: https://www.khronos.org/blog/khronos-releases-vulkan-video-av1-decode-extension-vulkan-sdk-now-supports-h.264-h.265-encode 

[2]  https://gitlab.freedesktop.org/airlied/mesa/-/tree/radv-vulkan-video-decode-av1

[3] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27424

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