RootCanal: Address resolution failure in connection initiation

- the previous code had an incorrect interpretation of the specification
  regarding resolved address type:
  public addresses were resolved with the identity address type,
  which mismatched with device address type.

- TargetA addresses were incorrectly resolved using the peer IRK

- add relevant CON/INI tests to validate the fixes

Bug: 317747068
Test: atest rootcanal_ll_test
Flag: EXEMPT, rootcanal change
Change-Id: Ieb4c85cf496e2db7dda6b8cf2c0419642b2703c5