Bluetooth: Controller: Fix ISO Data sn nesn on flush

Fix sn and nesn values of ISO data when starting a new burst.
When central retransmitted but did not get an ack, it did
not update the sn correctly causing the peripheral to drop
the next ISO data PDU.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
2 files changed