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backends/drm: disable software brightness if there was ever a hardware brightness device assigned

Xaver Hugl requested to merge work/zamundaaa/cherry-pick-brightness into Plasma/6.2

Software brightness is very useful when the backlight really can't be controlled by us, but if it's just temporarily unavailable because of powerdevil not running, or DDC/CI having issues, then it's best if we don't darken the image in software on top of the backlight level still being set by the display.

(cherry picked from commit 4f18aae6)

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