Allow activities to show on user 0 until provisioned

In a split-user mode, allow SUW and related apps to show UI
until the device is provisioned. Basically this changes the
logic a bit for when to force keyguard to always show on user 0.

Bug: 25326078
Change-Id: I8e862adae1c38efe9874479b532baa7446070035
1 file changed