drm/exynos: fixed overlay updating time at page flip.
buffer addess is set to shadow register and then applied to real register at vsync front porch time. Signed-off-by: NJoonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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