device: Support marking a device with wake allowed

device: Support marking a device with wake allowed

If a device is allowed to wake the host system from suspend, it should
be marked as wake allowed. We add support for a new property that is
sent to the kernel via set device flags mgmt op. We also add the dbus
endpoint to allow the wake allowed setting to be controlled.

In order for wake allowed to be set, the profile must also support wake.
This setting isn't exposed to the user but must be set by profiles that
intend to support wake from suspend.

If a device is connecting for the first time, it will be marked
WakeAllowed if the profile supports it. On subsequent reloads of bluez,
the stored setting "WakeAllowed" will be used to override any other
setting.

Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>