dts: rockchip: px30: add gpio-ranges property to gpio nodes

Add the gpio-ranges property to each GPIO node for use in deriving
the correct bank ID. Note that invoking "gpio status -a" no longer
causes the board to hit a "Synchronous Abort".

Fixes: 537b1a27 ("rockchip: add px30 devicetrees")

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>