CTKD: Fix role change bug on legacy BT stack

If a role switch happens before connection complete, we incorrectly
ignore the information. This can sometimes cause CTKD to not function
properly.

Bug: 186367778
Tag: #refactor
Test: atest net_test_main_shim, presubmit, manual role change testing
(with and without gd enabled)

Change-Id: I619376d35051a9b5ead74608a66fae1c5ea32c2b