ASoC: Intel: add drain_notify support

This patch adds the support to implement drain_notify in Intels mfld driver

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --cc sound/soc/intel/sst-mfld-platform-compress.c
Simple merge

diff --cc sound/soc/intel/sst-mfld-platform.h
Simple merge