hw/pci-host/aspeed: Add AST2600 PCIe Root Port and make address configurable

Introduce an ASPEED PCIe Root Port and wire it under the RC. The root port
is modeled as TYPE_ASPEED_PCIE_ROOT_PORT (subclass of TYPE_PCIE_ROOT_PORT).

Key changes:
- Add TYPE_ASPEED_PCIE_ROOT_PORT (PCIESlot-based) with vendor/device IDs
  and AER capability offset.
- Extend AspeedPCIERcState to embed a root_port instance and a
  configurable rp_addr.
- Add "rp-addr" property to the RC to place the root port at a specific
  devfn on the root bus.
- Set the root port's "chassis" property to ensure a unique chassis per RC.
- Extend AspeedPCIECfgClass with rc_rp_addr defaulting to PCI_DEVFN(8,0).

Rationale:
- AST2600 places the root port at 80:08.0 (bus 0x80, dev 8, fn 0).
- AST2700 must place the root port at 00:00.0, and it supports three RCs.
  Each root port must therefore be uniquely identifiable; uses the
  PCIe "chassis" ID for that.
- Providing a configurable "rp-addr" lets platforms select the correct
  devfn per SoC family, while the "chassis" property ensures uniqueness
  across multiple RC instances on AST2700.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250919093017.338309-6-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

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