Add M2Tech hiFace USB-SPDIF driver

Add driver for M2Tech hiFace USB-SPDIF interface and compatible devices.

M2Tech hiFace and compatible devices offer a Hi-End S/PDIF Output
Interface, see http://w

Add M2Tech hiFace USB-SPDIF driver

Add driver for M2Tech hiFace USB-SPDIF interface and compatible devices.

M2Tech hiFace and compatible devices offer a Hi-End S/PDIF Output
Interface, see http://www.m2tech.biz/hiface.html

The supported products are:

* M2Tech Young
* M2Tech hiFace
* M2Tech North Star
* M2Tech W4S Young
* M2Tech Corrson
* M2Tech AUDIA
* M2Tech SL Audio
* M2Tech Empirical
* M2Tech Rockna
* M2Tech Pathos
* M2Tech Metronome
* M2Tech CAD
* M2Tech Audio Esclusive
* M2Tech Rotel
* M2Tech Eeaudio
* The Chord Company CHORD
* AVA Group A/S Vitus

Signed-off-by: Antonio Ospite <ao2@amarulasolutions.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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