radv: vulkan video encode status

Vulkan 1.3.274 moves the Vulkan encode work out of BETA and moves h264 and h265 into KHR extensions. radv support for the Vulkan video encode extensions has been in progress for a while.

The latest branch is at [1]. This branch has been updated for the new final headers.

Updated: It passes all of h265 CTS now, but it is failing one h264 test.

Initial ffmpeg support is [2].

[1] https://gitlab.freedesktop.org/airlied/mesa/-/tree/radv-vulkan-video-encode-h2645-spec-latest?ref_type=heads

[2] https://github.com/cyanreg/FFmpeg/commits/vulkan/

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