Better flow for SIM PIN/ SIM PUK screens in keyguard.

We now fade between security screens when not coming from selection view.
In the case of SIM PIN/PUK screens, this means we show the user's security
screen without going back to the selector view.

This change also adds a fade animation for when we go between security screens
without going back to the selector view.

This also fixes a bug where we were invoking two checks for the SIM
state - one for ACTION_DOWN and another for ACTION_UP.

Change-Id: I260f9a2e0316cbf26ec7621f774bfdf9956ca488