LE CoC: Implement CAPIs

LE CoC: Implement CAPIs

This patch primarily handles following:
- CAPIs to create and listen to L2CAP_LE socket
- CAPIs to connect and disconnect to L2CAP_LE socket
- CAPIs to get PSM of the listening L2CAP_LE socket
- Event Handlers for connection, disconnection and
authorization of L2CAP_LE socket

To avoid build conflict please merge this patch after merging framework
patch: (Change-Id: Icf4d8a51acc444765a9b61224a3a5d3fd26bfa65)

Change-Id: I6ac0595799602db1402778da3f73109366a013c2
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>
Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>