ASoC: Intel: Skylake: Fix to ignore blob check if link type is HDA

If link type is HDA, NHLT blob is null, as NHLT defines non HDA
links only.  So we should ignore blob query for HDA links.

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>