incoming call, getCallDetails inform about AUDIO_ONLY

make public Call::setEarlyDetails and change its name
for Call::updateDetails().
This permits to change details at creation AND after
as in the case of RingAccount where we don't have
details when the call is created.

Change-Id: I145624f93358990ed36d027bdb47bd4e498b1770
Signed-off-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>