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backends/drm: Rework GPU removal

Vlad Zahorodnii requested to merge work/zzag/backend-extend-output-lifetime-on-gpu-hotplug into master

The proposed way to handle unplugged gpus allows us to ensure that removed outputs' lifetime can be extended to the moment when the Platform::outputsQueried signal is emitted.

Besides that, it's possible to extend this code a bit further to make sure that output updates are batched when hotplugging multiple gpus, e.g. after resuming, etc.

Edited by Vlad Zahorodnii

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