drm/radeon: add properties to configure the width of the underscan borders
This allows for a more exact fitting on the physical display. The new properties default to zero which corresponds to the previous underscan border width[height] formula: (display_width[display_width] >> 5) + 16. Example to set a horizontal border width of 30 and a vertikal border height of 22: xrandr --output HDMI-0 --set underscan on --set "underscan hborder" 30 --set "underscan vborder" 22 Signed-off-by: NMarius Gröger <marius.groeger@googlemail.com> Reviewed-by: NAlex Deucher <alexdeucher@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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