[PATCH] soundwire: intel: fix CONFIG_PM and CONFIG_PM_SLEEP confusion

[Pierre-Louis Bossart]

>> When CONFIG_PM_SLEEP is not defined, GCC throws compilation warnings:
>>
>> drivers/soundwire/intel.c:1816:12: warning: ‘intel_resume’ defined but
>> not used [-Wunused-function]
>>   1816 | static int intel_resume(struct device *dev)
>>        |            ^~~~~~~~~~~~
>>
>> drivers/soundwire/intel.c:1697:12: warning: ‘intel_suspend’ defined
>> but not used [-Wunused-function]
>>   1697 | static int intel_suspend(struct device *dev)
>>
>> Fix by adding the missing CONFIG_PM_SLEEP.
> 
> Can you rather use __maybe for for these rather than wrapping in another
> ifdef, that is the recommended way to do this

No objections, that would work as well.