Implement meta interface for the biometric HAL

The biometric HAL interfaces (android.hardware.biometric.face) were
frozen as part of the SC API finalization. The users of the interface
are required to implement the two meta interface (getInterfaceHash and
getInterfaceVersion).

Bug: 188713899
Test: m
Change-Id: Ie87db2b845cbd9f8b643df2c047836743246ff35