drm/mgag200: Remove HW cursor

The HW cursor of Matrox G200 cards only supports a 16-color palette
format. Univeral planes require at least ARGB or a similar component-
based format, so remove the HW cursor.

Alternatively, the driver could dither a cursor image from ARGB to
16 colors. But this does not produce pleasent-looking results in
general, so it's useless for modern compositors.

Without HW support, compositors will use software rendering.

Signed-off-by: Thomas Zimmermann <[email protected]>
Tested-by: John Donnelly <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Acked-by: Emil Velikov <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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