tbs: Use contact name instead of caller name as friendly name

Contact name seems to be more approperiate to be a value of friendly
name instead of caller name. Caller name from its intetion would cover
only a incoming caller name. Friendly name should cover both directions
of call initiation: incoming and outgoing.

Tag: #feature
Bug: 233349976
Test: atest TbsGenericTest
Change-Id: I888ca7a419e33306ea405a8c0caba899eac22994