GD L2cap: Pass more link callbacks to Security

Send Remote version request and supported feature request upon link
connection.
Security might be interested in LMP version and features, and ACL handle
(for legacy).

Tag: #gd-refactor
Bug: 141555841
Test: cert/run --host
Change-Id: I8c2f373cbdc2850a26c424fb370a041f4e183555