drm/xe: Update LRC context layout definitions

The new memory based interrupt processing uses additional entries
in the context.  Add required definitions.

Bspec: 45585, 60184
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20231214185955.1791-4-michal.wajdeczko@intel.com
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>