Bluez-hfp test creates an agent but it is not made default.
Because of this, when running in the Apertis SDK, an incoming connection
from bluetooth gets authorized by blueman agent which requires some
actions with the mouse to click the right button.
This is not appropriate as the agent from bluez-hfp is automated to
reduce the number of interactions from the tester.

Apertis: https://phabricator.apertis.org/T2880



Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
Signed-off-by: Frédéric Dalleau <frederic.dalleau@collabora.com>
Differential Revision: https://phabricator.apertis.org/D4898