vdpa: Fix some coding style issues

Fix some code indent issues and following checkpatch warning:

WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
371: FILE: include/linux/vdpa.h:371:
+static inline void vdpa_get_config(struct vdpa_device *vdev, unsigned offset,
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210831103634.33-5-xieyongji@bytedance.comSigned-off-by: Michael S. Tsirkin <mst@redhat.com>

include/linux/vdpa.h

@@ -364,9 +364,9 @@ static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features)
 	return ops->set_features(vdev, features);
 }
 
-
-static inline void vdpa_get_config(struct vdpa_device *vdev, unsigned offset,
-				   void *buf, unsigned int len)
+static inline void vdpa_get_config(struct vdpa_device *vdev,
+				   unsigned int offset, void *buf,
+				   unsigned int len)
 {
 	const struct vdpa_config_ops *ops = vdev->config;