ASoC: tegra: add tegra+MAX98090 machine driver

Initially, this binding and driver only describe/support playback to
headphones and speakers, and capture from the external microphone, with
GPIO-based jack detection for the headphone jack only.

This driver is useful for the Venice2 board.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --cc Documentation/devicetree/bindings/sound/nvidia,tegra-audio-max98090.txt
Simple merge

diff --cc sound/soc/tegra/Kconfig
Simple merge

diff --cc sound/soc/tegra/Makefile
Simple merge

diff --cc sound/soc/tegra/tegra_max98090.c
Simple merge