Remove redundant DeathRecipient for ImsServiceController

ImsServiceController was listening to both
ServiceConnection#onServiceDied and DeathRecipient#binderDied.
This is redundant, so remove DeathRecipient and move it to
where it is needed, ImsServiceControllerStaticCompat.

Also, fix a bug in ImsResolver where overriding the device
ImsService was not working properly (for manual testing).

Bug: 120151611
Test: atest FrameworksTelephonyTests:ImsServiceControllerTest
Change-Id: Ia02eb5b9708373107392e370ea06664e5de72687