drm/xe/display: move device_remove over to drmm

i915 display calls this when releasing the drm_device, match this also
in xe by using drmm. intel_display_device_remove() is freeing purely
software state for the drm_device.

v2: fix build error

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240522102143.128069-36-matthew.auld@intel.com