drm/i915/xehp: Define compute class and engine

Introduce a Compute Command Streamer (CCS), which has access to
the media and GPGPU pipelines (but not the 3D pipeline).

To begin with, define the compute class/engine common functions, based
on the existing render ones.

v2:
 - Add kerneldoc for drm_i915_gem_engine_class since we're adding a new
   element to it.  (Daniel)
 - Make engine class <-> guc class converters use lookup tables to make
   it more clear/explicit how the IDs map.  (Tvrtko)

v3:
 - Don't update uapi for now; we'll just include the driver-internal
   changes for the time being.

Bspec: 46167, 45544
Original-author: Michel Thierry
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Vinay Belgaumkar <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Signed-off-by: Daniele Ceraolo Spurio <[email protected]>
Signed-off-by: Aravind Iddamsetty <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]> #v1
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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