risc-v: add support for PCI and the PCIe controller in the JH7110 SoC.

Testing as working with xhci and nvme on VisionFive2.

Uses legacy PCI interrupts currently. MSIs to be added later.

pcihost_f

risc-v: add support for PCI and the PCIe controller in the JH7110 SoC.

Testing as working with xhci and nvme on VisionFive2.

Uses legacy PCI interrupts currently. MSIs to be added later.

pcihost_fdt code is 99% the same as the Arm version and should be shared.

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Call / define fdtbus_cpus_md_attach for platforms with cpus @ fdt.

The RISC-V binding here seems somewhat of an abuse, but it exists in
mainline linux.

RISC-V support that works on QEMU with a single hart.

Thanks for Simon Burge for plic(4).