main/bluez: OBEX file transfer and device advertisement
Fix OBEX file transfers by adding missing DBus activation service file. When a Bluetooth file transfer is started,
obexdis launched using DBus by BlueZ to handle the transfer. This makes Bluetooth file transfers in GNOME Control Center work.
Advertise devices with handheld chassis over Bluetooth as phones instead of computers. With this patch, postmarketOS phones can advertise themselves correctly to other Bluetooth devices. I will try to upstream the patch to BlueZ.