video: Add an enum for active low/high
This is used for video signals in some drivers so provide a standard way of representing it in an enum. Signed-off-by: NSimon Glass <sjg@chromium.org> Acked-by: NAnatolij Gustschin <agust@denx.de> Signed-off-by: NMinkyu Kang <mk7.kang@samsung.com>
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