commit e2656412 upstream.

Broxton and Skylake have the same behavior on display audio. So this patch
applys Skylake fix-ups to Broxton.
Signed-off-by: Lu, Han <han.lu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
[ kamal: backport to 3.19-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>