drm/exynos: Use drm_fb_helper_lastclose() and _poll_changed()

This driver can use drm_fb_helper_lastclose() as its .lastclose callback.
It can also use drm_fb_helper_output_poll_changed() as its
.output_poll_changed callback.

Cc: Inki Dae <[email protected]>
Cc: Joonyoung Shim <[email protected]>
Cc: Seung-Woo Kim <[email protected]>
Cc: Kyungmin Park <[email protected]>
Signed-off-by: Noralf Trønnes <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Acked-by: Inki Dae <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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