drm/i915: add .has_fenced_regions to parent interface

drm/i915: add .has_fenced_regions to parent interface

Add .has_fenced_regions() to display parent interface, removing more
dependencies on struct drm_i915_private, i915_drv.h, and
gt/intel_gt_types.h.

This allows us to remove the xe compat gt/intel_gt_types.h.

v2: s/fence_support_legacy/has_fenced_regions/ (Ville)

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/309f61a8742c3bf731c820b2f9e1024143db8598.1763370931.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>