[media] media: vb2-memops: Export vb2_get_vma symbol

The vb2_get_vma() function is called by videobuf2-dma-contig. Export it.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/videobuf2-memops.c

@@ -55,6 +55,7 @@ struct vm_area_struct *vb2_get_vma(struct vm_area_struct *vma)
 
 	return vma_copy;
 }
+EXPORT_SYMBOL_GPL(vb2_get_vma);
 
 /**
  * vb2_put_userptr() - release a userspace virtual memory area