Bluetooth: controller: Fix wrong CTE type in per adv report

The Bluetooth Core spec 5.2 requires to provide CTE type in
periodic advertising report.
The implementation of le_per_adv_sync_report assigned
value zero to be default CTE type. The assigned value
in Bluetooth Core spec 5.2 means "AoA Constant Tone
Extension". In case there is no CTE attached to periodic
advertising PDU, CTE type should contain value 0xFF.

This commit fixes the issue.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>