rpmsg: pass right device paramter to dma_free_coherent function

dma_alloc/free_coherent APIs requires the platform specific remoteproc
device as the device parameter. We are passing vdev->dev.parent to the
dma_free_coherent function which is wrong, it has to be
vdev->dev.parent->parent instead as in the dma_alloc_coherent function.

Signed-off-by: Fernando Guzman Lugo <fernando.lugo@ti.com>

drivers/rpmsg/virtio_rpmsg_bus.c

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 590cfaf..6c1db10 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -1008,7 +1008,7 @@
 	return 0;
 
 free_coherent:
-	dma_free_coherent(vdev->dev.parent, RPMSG_TOTAL_BUF_SPACE, bufs_va,
+	dma_free_coherent(vdev->dev.parent->parent, RPMSG_TOTAL_BUF_SPACE, bufs_va,
 					vrp->bufs_dma);
 vqs_del:
 	vdev->config->del_vqs(vrp->vdev);
@@ -1043,7 +1043,7 @@
 
 	vdev->config->del_vqs(vrp->vdev);
 
-	dma_free_coherent(vdev->dev.parent, RPMSG_TOTAL_BUF_SPACE,
+	dma_free_coherent(vdev->dev.parent->parent, RPMSG_TOTAL_BUF_SPACE,
 					vrp->rbufs, vrp->bufs_dma);
 
 	kfree(vrp);