UPSTREAM: ASoC: da7219: Add support for 1.6V micbias level

UPSTREAM: ASoC: da7219: Add support for 1.6V micbias level

HW can provide 1.6V micbias level as well the existing levels
already provided in the driver. This patch adds support for 1.6V
to the DT binding.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 0aed64c1766d354c819a13a57d8673adaf2266eb)

Change-Id: I714fb76154242aa6392143ebe8db20a7510b45a3
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>