ASoC: Intel: Skylake: Fix incorrect capture position reporting

HW recommends to set DUM bit on device power up, so that DPIB write
request occurs every frame regardless of whether DPIB has changed or
not. This addresses incorrect position reporting for capture streams.

Signed-off-by: Leoni Prodduvaka <leoni.prodduvaka@intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>