Enable PCIe gen2 speeds on RockPro64 boards

rockchip-pcie-gen2.d2s

/*  For  RockPro64 boards only!! */

/dts-v1/;
/plugin/;

/ {

        fragment@0 {
                target-path = "/pcie@f8000000";
                __overlay__ {
                        max-link-speed = <0x02>;

                };
        };

/*
        ## To install:

        *  dtc -O dtb -o /boot/dtb/rockchip/overlay/rockchip-pcie-gen2.dtbo rockchip-pcie-gen2.d2s

        *  Edit /boot/armbianEnv.txt and add
                overlays=pcie-gen2   ( or:  orverlays=[existing] pcie-gen2 )

        *  reboot
 */

};