[Feature]: VC-1 decoding support for DG2

### What Feature?

Currently, VC-1 decoding support is not available on Linux on DG2 devices even though they support it and decoding of vc1 works with Windows. Intel reference document also shows VC-1 support for DG2 cards. => https://www.intel.com/content/www/us/en/docs/onevpl/developer-reference-media-intel-hardware/1-1/overview.html#DECODE-OVERVIEW-DISCRETE

### What's the usage scenario would be benifited?

Transcode for media delivery, Playback

### What impacted?

Having VC-1 decoding support is necessary for playback and also transcoding scenarios.

Accelerating playback is nice, but more importantly for transcoding purposes. The sw decoder for vc-1 is limited to a single thread and therefore limiting transcodes quite a bit - having a GPU that could accelerate this is a must. As it already works on Windows I don´t really understand why it's not supported on Linux (yet).

Would be awesome if it could be added in a future release. Thanks.

### Do you want to contribute a patch to develop this feature?

None