Remove Session ID from ImsService APIs that do not need it.

Traditionally, to initiate a new call with the ImsService APIs,
you have to "open()" the interface, which returns a session ID.
This is not needed for querying other information, such as the
provisioning status of the ImsService slot.

Test: Manual
Change-Id: I155b291a49b9aa5ed9599f5a78b1e8d7ff9f8e1c