ASoC: simple-card: Add mic and hp detect gpios.

Allow Headphone and Microphone jack detect gpios to be specified in
device tree.  This will allow a few systems including rk3288_max98090
to use simple-card instead of having their own board file.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>