arm64: dts: rockchip: add bus-width properties to mmc nodes for px30

'bus-width' and pinctrl containing the bus-pins
should be in the same file, so add them to
all mmc nodes in 'px30.dtsi'.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20200416183053.6045-1-jbx6244@gmail.com


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