Add a codec driver to control ChromeOS EC codec.

Use EC Host command to enable/disable I2S recording and control other
configurations.
Signed-off-by: NCheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: NMark Brown <broonie@kernel.org>