According to the DT bindings, #gpio-cells must be two.

Fixes: 63e71fed ("ARM: dts: Add support for emtrion emCON-MX6 series")
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>