vulkan video: status update (anv + radv)

 Okay just a short status update.

radv H264/H265 decode:

The radv h264/h265 support has been merged to mesa main branch. It is still behind RADV_PERFTEST=video_decode flag, and should work for basics from VI/GFX8+. It still has not passed all the CTS tests.

anv H264 decode:

The anv h264 decode support has been merged to mesa main branch. It has been tested from Skylake up to DG2. It has no enable flag, just make sure to build with h264dec video-codec support. It passes all current CTS tests.

hasvk H264 decode:

I ported the anv h264 decoder to hasvk the vulkan driver for Ivybridge/Haswell. This in a draft MR (HASVK H264). I haven't given this much testing yet, it has worked in the past. I'll get to testing it before trying to get it merged.

radv AV1 decode:

I created an MR for spec discussion (radv av1). I've also cleaned up the radv AV1 decode code.

anv AV1 decode:

I've started on anv AV1 decode support for DG2. I've gotten one very simple frame to decode. I will attempt to do more. I think filmgrain is not going to be supported in the short term. I'll fill in more details on this when it's working better. I think there are a few things that might need to be changed in the AV1 decoder provisional spec for Intel, there are some derived values that ffmpeg knows that it would be nice to not derive again, and there are also some hw limits around tiles and command buffers that will need to be figured out.

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