virtio.h: add virtio_has_feature api for virtio driver

Virtio driver can used this api to judge whether the this feature
is supported by both virtio driver and device.

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

include/nuttx/virtio/virtio.h

@@ -38,6 +38,9 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
+#define virtio_has_feature(vdev, fbit) \
+      (((vdev)->features & (1UL << (fbit))) != 0)
+
 #define virtio_read_config_member(vdev, structname, member, ptr) \
       virtio_read_config((vdev), offsetof(structname, member), \
                          (ptr), sizeof(*(ptr)));