drm/i915: Nuke intel_plane_ggtt_offset()
We don't really need the extra intel_plane_ggtt_offset() wrapper
anymore. Get rid of it.
v2: Deal with reuse_vma() hacks
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250717171353.23090-3-ville.syrjala@linux.intel.com