iwm: Add device configuration definitions for 9000-series chips.

Match such chips using the device ID. We should really be checking the
subdevice as well, since a smaller number of 9460 and 9560 devices
actually belong to a new series of devices and require different
firmware, but that will require some extra logic in iwm_attach().

Submitted by: lwhsu, Guo Wen Jun <blockk2000@gmail.com>
MFC after: 2 weeks