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intel: Adds a workaround for HEVC decoding on some old platforms.

Hyunjun Ko requested to merge zzoon/mesa:use_legacy_engines into main

A quote from a commit message from the intel-vaapi-driver:

"The SKL/KBL GT3 machines have two BSD video rings, which can dispatch the video command. But the HEVC command is an exception, which can't be handled by the second BSD video ring. So we need to assure that the HEVC command always uses the first BSD video ring."

But we don't seem to get proper engine information from kernel.(drm/intel#8832) So we're adding a workaround for fixing it temporarily.

Closes #9172 (closed), #9314 (closed)

Edited by Hyunjun Ko

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