staging: most: make hardware parameters channel exclusive

Since the PCM interface's hardware parameters are channel/substream
exclusive, the struct snd_pcm_hardware needs to be embedded in the
channel structure.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>