ravb: Remove obsolete explicit clock handling for WoL

Currently, if Wake-on-LAN is enabled, the EtherAVB device's module clock
is manually kept running during system suspend, to make sure the device
stays active.

Since commit 91c719f5 ("soc: renesas: rcar-sysc: Keep wakeup
sources active during system suspend") , this workaround is no longer
needed.  Hence remove all explicit clock handling to keep the device
active.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NNiklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/ravb_main.c

@@ -2255,9 +2255,6 @@ static int ravb_wol_setup(struct net_device *ndev)
 	/* Enable MagicPacket */
 	ravb_modify(ndev, ECMR, ECMR_MPDE, ECMR_MPDE);
 
-	/* Increased clock usage so device won't be suspended */
-	clk_enable(priv->clk);
-
 	return enable_irq_wake(priv->emac_irq);
 }
 
@@ -2276,9 +2273,6 @@ static int ravb_wol_restore(struct net_device *ndev)
 	if (ret < 0)
 		return ret;
 
-	/* Restore clock usage count */
-	clk_disable(priv->clk);
-
 	return disable_irq_wake(priv->emac_irq);
 }