arm64: dts: rockchip: add pinctrl and alias to emmc node to rk3568-evb1-v10

Since the EMMC pins can be used for other functions as well, we need to
configure the pinctrl.

Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20210805120107.27007-8-michael.riesch@wolfvision.net


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