arm64: dts: rockchip: Add support for PCIe on helios64

This is enough to make the SATA controller visible:

# lspci
00:00.0 PCI bridge: Fuzhou Rockchip Electronics Co., Ltd RK3399 PCI Express Root Port
01:00.0 SATA controller: JMicron Technology Corp. JMB58x AHCI SATA controller

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20210510090932.970447-1-uwe@kleine-koenig.org


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