drm/xe/pf: Don't allow LMEM provisioning if LMTT isn't available on the device

The LMEM provisioning is applicable only on platforms with LMTT.

v2:
 - new commit description
 - use xe_gt_assert in xe_gt_sriov_pf_config_set_lmem instead return
   error,
 - disable pf_lmem_info if LMTT is not available
v3: fix condition in xe_gt_assert
v4: rebase

Signed-off-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://lore.kernel.org/r/20250513071321.700464-1-piotr.piorkowski@intel.com