net: ethernet: ti: am65-cpsw-qos: Demote non-conformant function header

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

 drivers/net/ethernet/ti/am65-cpsw-qos.c:364: warning: Function parameter or member 'ndev' not described in 'am65_cpsw_timer_set'
 drivers/net/ethernet/ti/am65-cpsw-qos.c:364: warning: Function parameter or member 'est_new' not described in 'am65_cpsw_timer_set'
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ti/am65-cpsw-qos.c

@@ -356,7 +356,7 @@ static void am65_cpsw_est_set_sched_list(struct net_device *ndev,
 		writel(~all_fetch_allow & AM65_CPSW_FETCH_ALLOW_MSK, ram_addr);
 }
 
-/**
+/*
  * Enable ESTf periodic output, set cycle start time and interval.
  */
 static int am65_cpsw_timer_set(struct net_device *ndev,