ALSA: ICE1712/24 - Change the Multi Track Peak control (level meters) from MIXER...

ALSA: ICE1712/24 - Change the Multi Track Peak control (level meters) from MIXER to PCM type

* PLEASE NOTE - this change requires the corresponding update of
  envy24control for ice1712 - kind of an ABI change.
* The "Multi Track Peak" control is read-only level meters indicator.
* The control is VERY confusing to most users since it is currently displayed
  in regular mixers. E.g. alsamixer ignores its read-only status
  and allows changing the levels with keys which makes no sense.

Signed-off-by: Pavel Hofman <[email protected]>
Acked-by: Jaroslav Kysela <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>