drm/xe/guc: add the plumbing for GUC_PAGING_CLASS

On newer platforms, the GuC has a new engine class which we need to use
to refer to the dedicated/reserved KMD BCS engine. With that, add the
plumbing in the GuC backend to support GUC_PAGING_CLASS and
GUC_CAPTURE_LIST_CLASS_PAGING.

Currently this is still turned off.

v2 (Daniele)
  - Also add adjust the capture list for hpg, so we account for nvl-s.
  - Move single paging engine assert to a more natural place.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patch.msgid.link/20260626111520.487997-15-matthew.auld@intel.com

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