drm/xe/buddy: add compatible and intersects hooks

Copy this from i915. We need .compatible for vram -> vram transfers, so
they don't just get nooped by ttm, if need to move something from
mappable to non-mappble or vice versa. The .intersects is needed for
eviction, to determine if a victim resource is worth eviction. e.g if we
need mappable space there is no point in evicting a resource that has
zero mappable pages.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>