ASoC: Intel: boards: Geminilake is only supported by SOF

Geminilake machine drivers are only tested and recommended with SOF.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191101173045.27099-11-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>