notification_proxy: Add disk_usage_changed notification
notification_proxy: Add disk_usage_changed notification

patweb/libimobiledevice,kalev/libimobiledevice,libimobiledevice-win32/libimobiledevice,kalev/libimobiledevice,libimobiledevice-win32/libimobiledevice,libimobiledevice/libimobiledevice,libimobiledevice-win32/libimobiledevice,upbit/libimobiledevice,Tatsh/libimobiledevice,patweb/libimobiledevice,Tatsh/libimobiledevice,libimobiledevice/libimobiledevice,patweb/libimobiledevice,Tatsh/libimobiledevice,upbit/libimobiledevice,upbit/libimobiledevice,kalev/libimobiledevice,Tatsh/libimobiledevice,libimobiledevice-win32/libimobiledevice