Remove binder call from fingerprint HIDL interface.

The code used to call Keystore.addAuthToken() directly from the HAL layer.
This change propagates the byte stream to the framework which then forwards
it to KeyStore.

Test: recovers from killing keystore, fingerprint unlocks device,
FingerprintDialog works with crypto objects.

Fixes bug 34264028

Change-Id: I378c183618e29681526958b5468e530bb603f688