FW sets 0xFFFF as invalid phase delta in invalid cases.
Retain same in HOST as well. In case of valid phase, add the
ibf cal value to the delta & ensure the derived phase value
is in the range of 0 - 1024 indicating 0 - 360 degrees
CRs-Fixed: 3597123
Change-Id: Ie259eb6c34393688c987a18859aa5036aa28b9da