drm/xe: Add mocs reset kunit

This kunit verifies the mocs registers content
with the KMD programmed values before and after
GT reset.

v2: Remove extra blank lines between the local variables
definitions (Matt Roper)

Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Ruthuvikas Ravikumar <ruthuvikas.ravikumar@intel.com>
Signed-off-by: Janga Rahul Kumar <janga.rahul.kumar@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20231222192352.927101-1-janga.rahul.kumar@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>