drm/exynos/fimc: simplify buffer queuing
The patch removes redundant checks, redundant HW reads and simplifies code. Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com> Reviewed-by: NJoonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: NInki Dae <inki.dae@samsung.com>
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