reset lockout deadline on device reboot

Gatekeeper retains lockouts after reboot, but framework
doesn't. This causes odd behavior on a reboot after a lockout
as gatekeeper refuses to check the password and the framework
thinks it's an invalid attempt. Reset the lockout deadline
if we notice the clock reset in the framework.

Bug: 23681267

Change-Id: I3127ccd8f205494af5a8ed2b44d4370c37cc2f8f