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Miglia Technology ships Harmony Audio 2004. It uses Oxford Semiconductor
OXFW970 for communication function in IEEE 1394 bus. This commit adds
support for the model.

In my opinion, the firmware of ASIC is really the initial stage, since
it has the following quirks.

* It skips several isochronous cycles to transmit isochronous packets
  when receiving any asynchronous transaction.
* The value of dbc field in the transmitted packet is the number of
  accumulated quadlets in CIP payload, instead of the accumulated data
  blocks. Furthermore, the value includes the quadlets of CIP payload in
  the packet.
* It neither supports AV/C Stream Format Information command nor AV/C
  Extended Stream Format Information command.
* The vendor and model information in root directory of configuration
  ROM includes some mistakes.

Additionally, when operating at 96.0 kHz, it often skips much isochronous
cycles to transmit the isochronous packets. The issue is detected as ...