ASoC: hdac_hdmi: Remove redundant assignments

Assignments for start_nid, end_nid and num_nodes of hdac_device
structure are already done in init.  So, remove the redundant
assignments.

Signed-off-by: Puneeth Prabhu <puneethx.prabhu@intel.com>
Signed-off-by: Guneshwor Singh <guneshwor.o.singh@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>