drm/udl: Convert to drm_atomic_helper_dirtyfb()

The infrastruture for atomic modesetting allows us to use the generic
code for dirty-FB and damage handling. Switch over udl and remove the
driver's implementation. The simple-pipe's update function now picks up
the primary plane's damage and updates a minimal region of the screen.

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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