sst: Fix for dmic capture on v2 pmic

currently capture through dmic captures only silence

This patch configurs the dmic registers to capture properly

Signed-off-by: Harsha Priya <priya.harsha@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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