As the power supply for a dGPU is only for powering devices connected
to dGPU, create a device property to indicate that the UCSI endpoint
is only for the scope of `POWER_SUPPLY_SCOPE_DEVICE`.
Is this a given fact?
I could imagine that a dGPU device would be capable of feeding power
back into the system, for example when an external docking station or
display device has a power supply connected to it.
Although I don't think it's possible (or safe) with a desktop system,
maybe a portable computer with a discrete GPU would be able to do this?
