hw/usb/hcd-xhci-pci: Move msi/msix properties from NEC to superclass

hw/usb/hcd-xhci-pci: Move msi/msix properties from NEC to superclass

The NEC XHCI controller exposes the underlying PCI device's msi and
msix properties, but the superclass and thus the qemu-xhci device do
not. There does not seem to be any obvious reason for this limitation.
This change moves these properties to the superclass so they are
exposed by both PCI XHCI device variants.

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20241227121336.25838-3-phil@philjordan.eu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>