arm64: dts: amlogic: meson-g12b-odroid-go-ultra: rename keypad-gpio pinctrl node

Fixes the following bindings check error:
pinctrl@40: keypad-gpio: {...} is not of type 'array'

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20230207-b4-amlogic-bindings-fixups-v2-v1-5-93b7e50286e7@linaro.org


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>