staging: most: sound: remove channel number from ALSA card's long name

Adding the channel number to the name of the sound card is wrong,
as the card does not represent a single streaming channel of the
MOST device.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>