[PATCH] asoc: add dummy codec

[Stas Sergeev <stsp@list.ru>]

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Hi.

The attached patch adds a dummy codec for the
asoc subsystem.
I use it with the driver that programs the soc to drive
I2S from an internal PLLs, and the audio then goes to
HDMI, so no external codec is used.
I've found spdif_transciever.c, which exactly is such a
dummy driver, but it is bound to the particular plat
device, so I made the device name a config option, and
if not set, the plat device is created with the default
name.

It may be possible to avoid the usage of the codec driver
at all, but I haven't succeeded with this, and the existance
of spdif_transciever.c suggests there is no such way.
Thoughts?

Signed-off-by: Stas Sergeev <stsp@users.sourceforge.net>

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