Update FP listening right after POWER_PRESSED err

Instead of delaying 500ms

Test: atest KeyguardUpdateMonitorTest
Test: Attempt to authenticate with SideFPS right
after pressing the power button => observe FP can
authenticate
Fixes: 259172472

Change-Id: I7f07c549628a21a92ddfac0d0679d0f054ad1dda
3 files changed