Bluetooth: Allow to enable debugs without connection support

BLUETOOTH_DEBUG and BLUETOOTH_DEBUG_HCI_CORE options are also useful
for Broadcaster and Observer roles and should not depends on connection
support.

Change-Id: Ice1142f3dcc5d73e5460449cc1444a1345eb624a
Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com>