Fix authentication problem due to deleted link key

When two SSP devices are paired and the other end
deletes the link key, any connection requests requiring
authentication will fail with the error code "PIN or Key missing".
In such a case, the link key has to be deleted and authentication
tried again.

Note: This is a temporary fix. The new management interfaces
will consolidate all the SSP logic.

Change-Id: I517b081c0014e75507554604dc45ae44f15050c4
3 files changed