Exit doze during an emergency call.

Exit Doze when there's an active emergency call so that
location and other critical features can work during the call.

Bug: 247441185
Bug: 263218207
Test: atest DeviceIdleTest
Test: atest FrameworksMockingServicesTests:DeviceIdleControllerTest

Change-Id: If2d643c4a371f6633968541b3b238a5898cba15d