The dev_info():s in the DSI driver are very talkative,
depromote these to dev_dbg().

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210313230913.4108256-1-linus.walleij@linaro.org