The function get_per_adv_sync is used by HCI events to get
reference to periodic advertising sync object related with
handle available in handled events. Due to implementation
of Direction Finding event handlers in separate source file,
direction.c instead of putting in hci_core.c the function
get_per_adv_sync has to be globally accessible.
Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>
Refactor out the scan roles handling from hci_core.c to its own source
file in scan.c.
Scan roles consists of regular scanning and synchronization to
periodic advertiser.
Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>
