call: remove uneeded friend classes from CallPrivate
call: remove uneeded friend classes from CallPrivate

This patch removes CallModel and CallModelPrivate to friends list
of CallPrivate.
This was a OOP design violation.

Issue: #78074
Change-Id: I5f98f8dfa4ff016c57072f464d5e1865650b9807

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc