h264: more AMD hw worked on

Previously I mentioned having AMD VCN h264 support. Today I added initial support for the older UVD engine[1]. This is found on chips from Vega back to SI.

I've only tested it on my Vega so far.

I also worked out the "correct" answer to the how to I send the reset command correctly, however the nvidia player I'm using as a demo doesn't do things that way yet, so I've forked it for now[2].

The answer is to use vkCmdControlVideoCodingKHR to send a reset the first type a session is used. However I can't see how the app is meant to know this is necessary, but I've asked the appropriate people.

The initial anv branch I mentioned last week is now here[3].


[1] https://gitlab.freedesktop.org/airlied/mesa/-/commits/radv-vulkan-video-uvd-h264

[2] https://github.com/airlied/vk_video_samples/tree/radv-fixes

[3] https://gitlab.freedesktop.org/airlied/mesa/-/tree/anv-vulkan-video-prelim-decode

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