These two patches supercede the prior similar three-patch set submitted on 6 Mov 2018. Apologies for the confusion. This patch is to update the arcxcnn backlight driver to use the proper "arctic" vendor-prefix and document that in the device- tree bindings. There is at least one existing device using the old "arc" vendor-prefix (Samsung Chromebook Plus), so support for that remains in the driver source. Unlike the previous patch set which hasn't been applied, there there is no actual functionality change here.
