Switch mono DMIC on to support wake-on-voice.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20191019143504.2.I57266d36564f393e9d701c9db648cc2efb0346fc@changeidSigned-off-by: Mark Brown <broonie@kernel.org>