Bluetooth: Allow setting of codec for HFP offload use case

This patch allows user space to set the codec that needs to
be used for HFP offload use case. The codec details are cached and
the controller is configured before opening the SCO connection.

Signed-off-by: Kiran K <kiran.k@intel.com>
Reviewed-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Reviewed-by: Srivatsa Ravishankar <ravishankar.srivatsa@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>