Update KeyguardUpdateMonitor to use biometricStrength

- The lockout of a class 3 biometrics with stop running all other
biometrics. SysUI won't run any biometrics when a class 3 biometric
is lock out
- Update & add tests

Test: atest KeyguardUpdateMonitorTest
Fixes: 272085679
Change-Id: Ic75723edadb1441feb14f25858e881fdb9f4a7b9