net: stmmac: tc: Fix TAPRIO division operation

For ARCHs that don't support 64 bits division we need to use the
helpers.

Fixes: b60189e0 ("net: stmmac: Integrate EST with TAPRIO scheduler API")
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>