Add support in kona machine driver to expose a sysfs node.
Userspace uses this sysfs node to notify machine driver
on which dai-link ( pcm id) is opened/closed. This information
regarding device open/close is then compared against shutdown/
startup dai_link ops. If there is a mismatch we conclude
that there has been a userspace service crash and we
issue a close all session command to dsp and also clear
all the dma buffers which were allocated by the service.
Change-Id: I4fc13adf8cc527c87b822a3b189d4ff081539a3c
Signed-off-by: Ashish Jain <ashishj@codeaurora.org>
