Do not show soft keyboard when locked out on keyguard UI

- Split password entry enabled and input enabled into two states;
- Disable input during lock check;
- Disable password entry when locked out;
- Don't show soft keyboard if password entry is disabled on resume;
- Auto show soft keyboard when password entry becomes enabled;

Bug:20542149
Change-Id: Iffe3f205776143ac21e25e337d5b7a0e6994ebf2