Integrate new MMTel APIs into the framework

Performs the bulk of the work of:
1) Moving the old MMTel APIs to a hidden
.compat namespace to support older vendor
versions of the code.

2) Replace the compat MMTel APIs with the
new ImsService APIs and integrate them
into existing code.

This is one of two CLs, this CL
integrates the new APIs, the next CL
creates the compat layer in telephony
to translate the .compat APIs to the new
APIs to allow Telephony to work with
older versions of the API.

Before commit, the corresponding vendor
changes will have to be submitted as well.

Bug: 63987047
Test: Telephony Unit tests
Merged-In: Icc9ecfdad000f42399beeac142083e62962c12d3
Change-Id: Icc9ecfdad000f42399beeac142083e62962c12d3