ASoC: SOF: pm: handle resume on legacy Intel platforms

Add new case when set_power_state() is not supported, e.g. for Intel
Baytrail/Cherrytrail legacy platforms.
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/20200526203640.25980-3-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/pm.c

@@ -114,8 +114,12 @@ static int sof_resume(struct device *dev, bool runtime_resume)
 		return ret;
 	}
 
-	/* Nothing further to do if resuming from a low-power D0 substate */
-	if (!runtime_resume && old_state == SOF_DSP_PM_D0)
+	/*
+	 * Nothing further to be done for platforms that support the low power
+	 * D0 substate.
+	 */
+	if (!runtime_resume && sof_ops(sdev)->set_power_state &&
+	    old_state == SOF_DSP_PM_D0)
 		return 0;
 
 	sdev->fw_state = SOF_FW_BOOT_PREPARE;