ASoC: Intel: broadwell: add missing pm_ops

For some reason this ops is missing in 2 out of the 3 broadwell
drivers. Add to make sure ASoC takes care of power management.
Tested-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20201112223825.39765-2-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/broadwell.c

@@ -318,6 +318,7 @@ static struct platform_driver broadwell_audio = {
 	.remove = broadwell_audio_remove,
 	.driver = {
 		.name = "broadwell-audio",
+		.pm = &snd_soc_pm_ops
 	},
 };