[PARISC] Update harmony from parisc tree

[PARISC] Update harmony from parisc tree

o Added a control for the input source (which can be either
  "line" or "mic")

o Mute the speaker/line-out/headphone outputs by default.

o Increased the buffer size from 10 pages to 16.

Signed-off-by: Stuart Brady <sdb@parisc-linux.org>
ALSA Harmony was resetting the capture position when
preparing the capture substream, which it shouldn't do.
This should fix the problem.

Signed-off-by: Stuart Brady <sdb@parisc-linux.org>
ALSA Harmony should no longer play junk (left in the buffers
from a previous stream) at the start of a new stream.

Implement the monitor mixer channel for ALSA Harmony.

Also prevent snd_harmony_volume_get from returning negative values.

Signed-off-by: Stuart Brady <sdb@parisc-linux.org>
Use the graveyard/silence buffers in ALSA Harmony.

Signed-off-by: Stuart Brady <sdb@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>