drm/xe/pat: Use table-based programming of PAT settings

Provide per-platform tables of PAT values rather than per-platform
functions.  This will simplify the handling of unicast vs MCR registers
in the upcoming patches.

Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://lore.kernel.org/r/20230324210415.2434992-3-matthew.d.roper@intel.com


Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>