ASoC: SOF: add set_power_state() to dsp_ops for power state update

D0i3 is a platform-defined substate of D0, so we need a
platform-specific callback in dsp_ops to handle the relevant
configurations.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191025224122.7718-4-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>