Fixed SMP failure for Privacy enabled Multi-Adv

When privacy is enabled and multi adv instance is used, SMP pairing
was failing as wrong local connection address was used. Included a fix
so that local connection address is always updated when connection handle
to adv instance mappping event is received.

Bug: 16872808
Change-Id: I288cd6cd85fe8547d0e85b1d8419a3412a993126