Bluetooth: Load Connection Parameters Command

This patch introduces the Load Connection Parameters command in
Management Interface. This command is used to inform the kernel
what connection parameters should be used during connection
establishment.

This command is only supported on controllers with LE support and
it can be issued while in power on or off mode. Finally, it only
accepts connection parameters from device with identity address.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>