drm/xe: Remove unused xe parameter

drm/xe: Remove unused xe parameter

Remove the xe parameter from the pde_encode_pat_index and
pte_encode_pat_index functions, as it is no longer used.

Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Reviewed-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240813104419.2958046-1-himal.prasad.ghimiray@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>