runtime: Generalize VFIO devices

Generalize VFIO devices to allow for adding AP in the next patch.
The logic for VFIOPciDeviceMediatedType() has been changed and IsAPVFIOMediatedDevice() has been removed.

The rationale for the revomal is:

- VFIODeviceMediatedType is divided into 2 subtypes for AP and PCI
- Logic of checking a subtype of mediated device is included in GetVFIODeviceType()
- VFIOPciDeviceMediatedType() can simply fulfill the device addition based
on a type categorized by GetVFIODeviceType()

Signed-off-by: Jakob Naucke <jakob.naucke@ibm.com>

src/runtime/virtcontainers/qemu_arch_base.go

@@ -675,16 +675,17 @@ func (q *qemuArchBase) appendVhostUserDevice(ctx context.Context, devices []govm
 }
 
 func (q *qemuArchBase) appendVFIODevice(devices []govmmQemu.Device, vfioDev config.VFIODev) []govmmQemu.Device {
-	if vfioDev.BDF == "" {
+	pciDevice := vfioDev.(config.VFIOPCIDev)
+	if pciDevice.BDF == "" {
 		return devices
 	}
 
 	devices = append(devices,
 		govmmQemu.VFIODevice{
-			BDF:      vfioDev.BDF,
-			VendorID: vfioDev.VendorID,
-			DeviceID: vfioDev.DeviceID,
-			Bus:      vfioDev.Bus,
+			BDF:      pciDevice.BDF,
+			VendorID: pciDevice.VendorID,
+			DeviceID: pciDevice.DeviceID,
+			Bus:      pciDevice.Bus,
 		},
 	)