Fix L2cap LE COC security record leaks

- When we are client, we don't need to register security during L2cap
registration.
- When we are done, we clean up security record by PSM; Service ID might
be invalid.
- Once the btif topshim facade initial commit is done, we can repro this
and verify the fix with test automation.

Tag: #stability
Bug: 193142224
Test: CtsVerifier LE COC Client for many times; later we will have an
automated test for this
Change-Id: I90fd23ce26c65ca3314e0754a2630d3f63c5d5d8
Merged-In: I90fd23ce26c65ca3314e0754a2630d3f63c5d5d8