arm64: dts: rockchip: add pinctrl for mipi-pdn pin on px30-evb

Add right mux for mipi-pdn. Mux this pad as gpio2 14

Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
Link: https://lore.kernel.org/r/20220620161321.1898840-3-tommaso.merciai@amarulasolutions.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>