graphics/mesa-dri: enable codecs for Vulkan Video after 29d855b6f775

Mesa 23 enabled Vulkan Video itself but all codecs are disabled by
default due to patents. Copy -Dvideo-codecs from mesa-gallium-va to
avoid the following error:

[ffmpeg/video] h264: Device does not support decoding h264!

$ vulkaninfo | fgrep decode
<empty>
$ export ANV_VIDEO_DECODE=1 RADV_PERFTEST=video_decode
$ vulkaninfo | fgrep decode

VK_KHR_video_decode_queue                   : extension revision 7

$ pkg upgrade mesa-dri
$ vulkaninfo | fgrep decode

VK_KHR_video_decode_h264                    : extension revision 8
VK_KHR_video_decode_queue                   : extension revision 7

PR: 275360
Approved by: manu