ASoC: Intel: Add PM support to HSW/BDW PCM driver

Add PM and RTD3 support to the HSW/BDW PCM driver. The PCM driver will
now save DSP context and then power off the DSP when it's not in use.
DSP power and context is then restored when it's next used.
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/sst-dsp.h

@@ -30,6 +30,9 @@
 #define SST_DMA_TYPE_DW		1
 #define SST_DMA_TYPE_MID	2
 
+/* autosuspend delay 5s*/
+#define SST_RUNTIME_SUSPEND_DELAY	(5 * 1000)
+
 /* SST Shim register map
  * The register naming can differ between products. Some products also
  * contain extra functionality.