Add support for exynos5420 mixer IP in the drm mixer driver.
Signed-off-by: NRahul Sharma <rahul.sharma@samsung.com>
Acked-by: NSeung-Woo Kim <sw0312.kim@samsung.com>
Reviewed-by: NTomasz Figa <t.figa@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>