Bluetooth: hci_sync: Enable events for BIS capable devices

In the case of a Synchronized Receiver capable device, enable at start-up the
events for PA reports, PA Sync Established and Big Info Adv reports.

Signed-off-by: Claudia Draghicescu <claudia.rosu@nxp.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>