drm/exynos: remove to call mixer_wait_for_vblank
The reason waiting vblank is to be power gated and disabled clocks after dma operation is completed. The dma operation is stopped already before be power gated and clocks are disabled when mixer is disabled by commit 381be025("drm/exynos: stop mixer before gating clocks during poweroff"). Don't need to wait vblank anymore. Signed-off-by: NJoonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: NInki Dae <inki.dae@samsung.com>
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