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device-pine64-pinebookpro: add udev rule for setting backlight perm

Administrator requested to merge pbp-backlight into master

There's a generic udev rule to set group ownership of backlights to 'video', but it only runs on the ADD action, which seems to be too late(?) since the backlight device is never owned by 'video' on boot.

This rule will run on CHANGE too, which might be overkill but seems to get the job done. It's now possible to set the backlight brightness on the PBP as a normal user.

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