Upstream: fix ops (comments from Mark Brown) #525

> +/* control */
> +static inline int snd_sof_dsp_run(struct snd_sof_dev *sdev)
> +{
> +	if (sdev->ops->run)
> +		return sdev->ops->run(sdev);
> +
> +	return 0;
> +}

Do we really want to return 0 for all these ops if they're not
implemented?  For some that seems sensible but there's others where it
seems like the caller might want to know they got ignored and an error
code like -ENOTSUPP might be better.