Dialer: lock screen appear before incoming call screen

-Screen wakes up earlier than InCallActivity is created by Incoming
 Call

-Show InCallUI after InCallActivity has been created and is running
 as long as activity is not destroyed or finishing.

CRs-Fixed: 1113931
Change-Id: I64678f8f4d0c10b9fadd61357ed2140eb9bbdf7e