drm/xe: Set PTE_AE for smem allocations in integrated devices

Without this if a atomic operation is executed in Xe2 integrated GPUs
it causes engine memory catastrophic error.

This fixes at least 3 failures in piglit sanity and 2 failures in
crucible for LNL.

v3:
- only add PTE_AE to smem in integrated

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>