Bluetooth: Audio: Update VCS API to use bt_vcs

Update the VCS API to use the bt_vcs struct instead
of the bt_conn. This is create a more simple API
that uses a, remote or loca, instance pointer, rather
than a specified connection (for remote) or NULL (for
local) operations.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
8 files changed