drm/exynos: scaler: Fix support for YUV420, YUV422 and YUV444 modes

Fix Cb/CR components order in two-planar YUV420, YUV422 and YUV444 modes.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>