During suspend and runtime_suspend audio dsp will be in D3 state
and will loose its context.

This patch adds support in driver to save the dsp context
and restore this context during resume
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Ramesh Babu K V <ramesh.babu@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>