drm: bridge/dw_hdmi: add mode_valid support
some platform may not support all the display mode, add mode_valid interface check it Signed-off-by: NAndy Yan <andy.yan@rock-chips.com> Tested-by: NRussell King <rmk+kernel@arm.linux.org.uk> Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
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