vitrio-pci.c: add virtio-pci transport support for Nuttx

1. only support pci modern device;
2. need the pci controller support MSI/MSI-X;
It has been verified based on virtio-rng and virtio-net.

Signed-off-by: Yongrong Wang <wangyongrong@xiaomi.com>
Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>

drivers/virtio/Make.defs

@@ -28,6 +28,10 @@ ifeq ($(CONFIG_DRIVERS_VIRTIO_MMIO),y)
   CSRCS += virtio-mmio.c
 endif
 
+ifeq ($(CONFIG_DRIVERS_VIRTIO_PCI),y)
+  CSRCS += virtio-pci.c
+endif
+
 ifeq ($(CONFIG_DRIVERS_VIRTIO_BLK),y)
   CSRCS += virtio-blk.c
 endif