Sensor Reading Get: Add threshold byte

Third byte should show threshold status based on
spec. Add the threshold data and update to the new
api.

Tested: Sensor list still worked, used sensor overide
to modify threshold and saw byte in sensor get. sdr elist
also started showing status.

Change-Id: Ic08555563b62048f334b5cb4aaedcd3fcef1f5f7
Signed-off-by: James Feist <james.feist@linux.intel.com>
2 files changed