pairing: Fix occasional DHKey check failure

This patch makes sure that SMP will always get OTA addresses for the
given ACL handle which are needed to F5 and F6 function while pairing
and increasing security on existing link.

Bug: 294604632
Bug: 259918455
Test: atest bluetooth_test_gd_unit
Test: pairing with Dual Mode and Le Devices
Test: 1. pair with security 1. 2. Disconnect device 3. Reconnect device
and increase security.

Tag: feature
Change-Id: I90522eae3bd46667d72c1fb6b1eeb7779156ed8e