net: ti: Fix wrong struct name in comments

Fixes the following W=1 kernel build warning(s):

 drivers/net/ethernet/ti/cpsw_ale.c:88: warning: expecting prototype for struct ale_dev_id. Prototype was for struct cpsw_ale_dev_id instead

Cc: Cyril Chemparathy <cyril@ti.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Yang Shen <shenyang39@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>