Add security handling for LE connection oriented channels

Use case:
Run PTS test cases TP/LE/CFC/BV-10-C to BV-16-C

Steps:
1. These test cases executed with two DUT as PTS support not available
2. Set desired security level on DUT and Remote with tool
3. Initiate LE COC connection request from DUT

Failure:
LE COC connection accepted though even remote security are not met.

Fix:
Added security handling for COC connection

Test: Ran sl4a test for BleCocTest
Change-Id: I5f6385d462698582e701b5a07953c0ccb932bbbf