net: ethernet: ti: cpsw: use dev_id for ale configuration

The previous patch has introduced possibility to select CPSW ALE by using
ALE dev_id identifier. Switch TI cpsw driver to use dev_id="cpsw" and
perform clean up by removing "ale_entries" configuration code.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>