Added shell module for the Bluetooth Controller's ticker
interfaces.
For now, info command enumerates active tickers' details.
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
All the files under shell subdir shall only be build if
CONFIG_BLUETOOTH_SHELL is selected.
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>