drm/omap: dsi: drop useless channel checks
A DSI peripheral can have virtual channel ID of 0-3. This should be always the case, and there's no need in the driver to validate the channel. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-64-tomi.valkeinen@ti.com
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