ASoC: Intel: bdw-rt5677: 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/20201112223825.39765-3-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/bdw-rt5677.c

@@ -446,6 +446,7 @@ static struct platform_driver bdw_rt5677_audio = {
 	.probe = bdw_rt5677_probe,
 	.driver = {
 		.name = "bdw-rt5677",
+		.pm = &snd_soc_pm_ops
 	},
 };