If there is an explicit configuration, assign the RandR provider
of the GPUDevice to the screen it was specified for.
If there is no configuration (default case) the screen number is
still 0 so it doesn't change behaviour.
The result is e.g:
# DISPLAY=:0.2 xrandr --listproviders
Providers: number : 2
Provider 0: id: 0xd2 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 0 name:modesetting
Provider 1: id: 0xfd cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 2 outputs: 2 associated providers: 0 name:Intel
Signed-off-by: Zoltán Böszörményi <zboszor@gmail.com>
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