ASoC: SOF: ops: fallback to mmio in helpers

Returning an error when a read/write is not implemented makes no
sense, especially on read where no return value makes sense.

Change the logic to directly fallback to mmio. If a platform truly
wants other read/writes that are not plain vanilla mmio, it needs to
implement its own routines.

Signed-off-by: Pierre-Louis Bossart <[email protected]>
Reviewed-by: Ranjani Sridharan <[email protected]>
Reviewed-by: Rander Wang <[email protected]>
Reviewed-by: Péter Ujfalusi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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