Add update context method to face and fingerprint HAL.

This is needed for changes that occur mid-operation and was lost
from the previous changes when switching from the single context
method to the overloaded approach.

Bug: 204584403
Test: atest VtsHalBiometricsFingerprintTargetTest VtsHalBiometricsFaceTargetTest

Change-Id: Ie917bce9de910a421e19130b6e518bd6fc85298e