Add a tuning script for raspberrypi for alsc only, that uses libtuning.
Since there will also be a tuning script for raspberrypi that has more
modules, put the libtuning alsc module definition in a separate file so
that it can be reused later.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
