When drm properties are created, they are added to mode_config.property_list,
which is then used in drm_mode_config_cleanup() to destroy every single
property created by the driver.

Cc: Chandra Konduru <chandra.konduru@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: NDamien Lespiau <damien.lespiau@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>