Bluetooth: controller: add missing ADI support in per adv chains

Recently there was added ADI support to periodic advertising.
There was missing implementation of ADI for periodic advertising
chained PDUs and direction finding. Also unit tests for periodic
advertising chains required update to handle ADI field.

The commit provides missing implementation.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>