Start BiometricService even if no hardware is present

* BiometricService already has support for authenticate() to fallback to CDC.
  This allows BiometricPrompt to ask for credentials when no biometric
  hardware is present, rather then doing nothing.

Issue: FP2A10-159
Change-Id: Ib69b913a9e9a6d4d76de5d2ee9e618a3dfd6e5bd
3 files changed