drm/sun4i: Add scaler configuration to DE2 mixers
No all SoCs support scaling on all channels. For example, V3s support scaling only on VI channels. Because of that, add additional configuration bitmask which tells which channel support scaler. Signed-off-by: NJernej Skrabec <jernej.skrabec@siol.net> Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171201060550.10392-21-jernej.skrabec@siol.net
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