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backends/drm: Improve PauseDevice/ResumeDevice signal handling

Vlad Zahorodnii requested to merge work/zzag/drm-backend-pause-resume-device into master

systemd takes care of setting and dropping master permissions when sending PauseDevice and ResumeDevice signals.

When the ResumeDevice signal is received, the relevant drm device should already have master permissions set up.

On the other hand, when the active property changes, there's still a chance that systemd haven't granted drm master permissions to us.

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