ASoC: wm_adsp: Return whether changed when writing controls

Functions that update cs_dsp controls need to handle return codes that
indicate whether the control value changed. A return code of 1 indicates
a change, 0 indicates no-change and a negative value is an error
condition.

Acked controls implicitly change value when written so a successful
write shall always report that the value changed.

Signed-off-by: Simon Trimmer <[email protected]>
Signed-off-by: Richard Fitzgerald <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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