Currently the function is called at every link up event, although the
FQID values will only change when the DPNI is disconnected from the
current object and reconnected to a different one.

The patch also avoids the forward declaration of update_tx_fqids.
Signed-off-by: NIoana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>