drm/udl: Use drm_fb_helper deferred_io support

Use the fbdev deferred io support in drm_fb_helper.
The (struct fb_ops *)->fb_{fillrect,copyarea,imageblit} functions will
now schedule a worker instead of being flushed directly like it was
previously (recorded when in atomic).

This patch has only been compile tested.

Signed-off-by: Noralf Trønnes <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Tested-by: Gerd Hoffmann <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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