x86/acpi: Add VFCT table

Add VFCT table to provide PCI Optiom Rom for
AMD graphic devices.
Useful for GNU Linux payloads and embedded dual GPU systems.

Tested on Lenovo T500 with AMD RV635 as secondary gpu.

Original Change-Id: I3b4a587c71e7165338cad3aca77ed5afa085a63c
Signed-off-by: Patrick Rudolph <siro@das-labor.org>

Change-Id: I4dc00005270240c048272b2e4f52ae46ba1c9422
Reviewed-on: https://review.coreboot.org/18192
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/device/pci_device.c

@@ -735,6 +735,9 @@ struct device_operations default_pci_ops_dev = {
 	.read_resources   = pci_dev_read_resources,
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+	.write_acpi_tables = pci_rom_write_acpi_tables,
+#endif
 	.init             = pci_dev_init,
 	.scan_bus         = 0,
 	.enable           = 0,