ASoC: Intel: boards: add explicit dependency on GPIOLIB when DMIC is used

ASoC: Intel: boards: add explicit dependency on GPIOLIB when DMIC is used

SND_SOC_DMIC depends on GPIOLIB, so let's add the dependency before
selecting SND_SOC_DMIC.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200427165211.23463-2-ranjani.sridharan@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>