arm64: dts: rockchip: fix PCI reg address warning on rk3399-gru

Warning (pci_device_reg): /pcie@f8000000/pcie@0,0:reg: PCI reg address is not configuration space

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Link: https://lore.kernel.org/r/20210918164153.207146-1-tomm.merciai@gmail.com


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