virtio_fs: correct tags for config space fields

Since fs is a modern-only device,
tag config space fields as having little endian-ness.

Signed-off-by: Michael S. Tsirkin <[e-mail]>
Acked-by: Vivek Goyal <[e-mail]>
Acked-by: Vivek Goyal <[e-mail]>
Reviewed-by: Cornelia Huck <[e-mail]>

include/uapi/linux/virtio_fs.h

···
 	__u8 tag[36];
 
 	/* Number of request queues */
-	__u32 num_request_queues;
+	__le32 num_request_queues;
 } __attribute__((packed));
 
 #endif /* _UAPI_LINUX_VIRTIO_FS_H */