Added machine driver to instantiate I2S based sound card on Snow
board. It has MAX98095 audio codec on board.

There are some other variants for Snow board which have MAX98090
audio codec. Hence support for MAX98090 is also added to this
driver.
Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
Signed-off-by: NMark Brown <broonie@linaro.org>