video: Allow driver to specify the line length
At present line_length is always calculated in video_post_probe(). But some hardware may use a different line length, e.g. with a 1366-wide display. Allow the driver to set this value if needed. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NAnatolij Gustschin <agust@denx.de>
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