LE: Peer device's latest RPA is not being applied

The latest discovered address is not used when reconnecting to devices
using resolvable private addresses, if RPA resolution offloadin is not
supported in the controller.
This patch also address the exception case where BT off is memseting
all control value while the IRK list is still being cleaned up.

Bug: 17187661
Change-Id: Ifeb5b8297e7eadb0e34ec1afbd41f46bdd836cf3
Author: Chaojing Sun <cjsun@broadcom.com>