drm/vc4: Add support for per plane scaling filter selection
Seeing as the HVS can be configured with regard the scaling filter,
and DRM now supports selecting scaling filters at a per CRTC or
per plane level, we can implement it.
Default remains as the Mitchell/Netravali filter, but nearest
neighbour is now also implemented.
Signed-off-by:
Dave Stevenson <dave.stevenson@raspberrypi.com>
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