4/n: AuthContainerView should filter out non-biometric modalities

The code assumed that any modality passed over was biometric-only.
However, this is not guaranteed, since the bitmask may include
DEVICE_CREDENTIAL. As such, remove non-biometric bits from
consideration.

Unit tests will be added in the future when the interface between
BiometricService and SystemUI are updated.

Bug: 149067920

Test: CtsVerifier

Change-Id: I707343b40013cdb7d4709aeaa8245fe0fd30c729