ASoC: mt6358: Validate Wake on Voice 2 writes

Currently the Wake on Voice 2 control accepts and stores any value written
but it reports that only 0 and 1 are valid values. Reject any out of range
values written by userspace.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230224-asoc-mt6358-quick-fixes-v1-2-747d9186be4b@kernel.org


Signed-off-by: Mark Brown <broonie@kernel.org>