staging: rtl8723bs: Remove no-op netdevice_notifier()

staging: rtl8723bs: Remove no-op netdevice_notifier()

rtw_ndev_notifier_call() does not do anything other then
a netdev_dbg() + always returning NOTIFY_DONE.

Remove the no-op notifier.

This also fixes a WARN() when unbinding + rebinding the driver
which was caused by the remove() method not unregistering
the notifier.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20241024181052.67031-1-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>