Dp_rx_vdev_detach() will flush all gro skb to make sure the
net_dev stored in skb is valid before this vdev is down, but
dp_rx_vdev_detach() is only invoked at the end of function
dp_vdev_detach_wifi3(). for some case, if there is still dp_peer
pending when execute dp_vdev_detach_wifi3(), dp_rx_vdev_detach()
won't be invoked.
Move dp_rx_vdev_detach() before pending peer detection in
dp_vdev_detach_wifi3() so that gro queue skb flushing can be
executed each time.
Change-Id: I0feea5b77de7efab884c0e5822c8671119892f7d
CRs-fixed: 2649385
248f7bd35a