ASoC: Intel: Skylake: Ignore rate check for DMIC link

DMIC NHLT entry is sample rate agnostic, so ignore the rate
checks for DMIC type

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>