drm/bridge: chipone-icn6211: Add mode_set API

Get the display mode settings via mode_set bridge
function instead of explicitly de-reference.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211119145325.1775046-2-jagan@amarulasolutions.com


Reviewed-by: Robert Foss <robert.foss@linaro.org>