hal: Update Single mic device from Fluence to ECNS

- Single mic fluence devices are never used when fluence type is
  not enabled. When fluence is not enabled, single mic devices
  should use ECNS.
- Remove checks for fluence type to enable set echo reference for
  non fluence usecases.

CRs-Fixed: 2275470
Change-Id: I6d76e6332960663583a082c0de933854403255f5