Remove phoneId from ImsUceManager

ImsUceManager does not need to be created per phoneId, since
the UCE service is created per subscription in RcsStackAdaptor.

Fixes: 147319232
Test: manual; bring up/down RcsService on a MSIM device
Change-Id: If9f89f8f083197c68900a6c1a51837ce0dd0b4a0