ASoC: Intel: bytcr_rt5640: Fix Dell Venue 8 5830 Pro quirk

This fixes the following 3 issues:

1) The sys_vendor match should be for "Dell Inc." not "DellInc.",
   without this fixed the quirk never gets applied
2) DMIC1 is used not DMIC2, this was not a problem sofar because for
   regular BYT boards (rather then BYTCR) we default to DMIC1 and because
   of 1. the quirk was not being applied
3) The Dell Venue 8 5830 Pro only has a single speaker

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>