drm/xe: remove unused struct xe_device members

drm/xe: remove unused struct xe_device members

modeset_restore_state has been unused since commit 6af0ffc0db93
("drm/i915/display: move restore state and ctx under display
sub-struct").

member global_obj_list has been unused since commit e2925e19c006
("drm/i915/display: move global_obj_list under display sub-struct").

hti_state has been unused since commit 62749912540b ("drm/i915/display:
move hti under display sub-struct").

snps_phy_failed_calibration has been unused since commit 3a7e2d58f800
("drm/i915: move snps_phy_failed_calibration to display sub-struct under
snps").

Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240321161548.3509672-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>