floss: media: Store call status and handle CLCC in stack

The call status was stored in topshim, which is a place that is better
to keep stateless. This CL wired the related callbacks/interfaces and
moved the call status to the Floss stack, which is helpful to the
upcoming telephony commands implementation.

Bug: 214149380
Tag: #floss
Test: ./build.py --target test
Change-Id: I947bc460cd8d9e4c8681b03eaed527a8670b5222