staging: most: add multi channel support to sound AIM

This patch adds 5.1 surround configuration with subbuffer cross-check,
when establishing a link to the core. For the sake of simplicity, only
one specific channel configuration is allowed.

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