Adds an overlay for radio power off delay due to IMS deregistration

Adds a 3 second delay after radio power off is triggered for the
device to complete IMS deregistration before triggering power off
on the radio in response to events such as APM and power off.

Bug: 195304068
Test: manual; atest FrameworksTelephonyTests:ServiceStateTrackerTest
Change-Id: Ib1e28ee07459f1770d3c199d0d94ac147a667528
1 file changed