Add LE L2CAP Connection Oriented Channel

This implementation for LE L2CAP Connection Oriented Channel (a Bluetooth
Core Spec 4.1 feature) has been tested on the following formal and informal
IOP events conducted by BT SIG Sport and Fitness Working Group.

* Informal IOP – Tokyo 2014
* UPF 49 – Berlin 2014
* Formal IOP – Tokyo 2014
* Formal IOP – Santa Clara 2015

Change-Id: Ia6de62f9321a78b98930629f65078884157a9c0d
Signed-off-by: Navin Kochar <navin.kochar@intel.com>