Fix 2520598: Disable password entry in keyguard while in lockout

The password unlock wasn't abiding by the 30s lockout rule.
This change adds the necessary logic and countdown timer to
disable text entry while in lockout mode. After 30s, text entry
is re-enabled until the next lockout count is reached.

Change-Id: I4d860565cad91cb88c36615b40d1837a5d97fe21