net: ravb: Make reset controller support mandatory

On the RZ/G3S SoC the reset controller is mandatory for the IP to work.
The device tree binding documentation for the ravb driver specifies that
the resets are mandatory. Based on this, make the resets mandatory also in
driver for all ravb devices.
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/renesas/Kconfig

@@ -34,6 +34,7 @@ config RAVB
 	select MII
 	select MDIO_BITBANG
 	select PHYLIB
+	select RESET_CONTROLLER
 	help
 	  Renesas Ethernet AVB device driver.
 

drivers/net/ethernet/renesas/ravb_main.c

@@ -2645,7 +2645,7 @@ static int ravb_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+	rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 	if (IS_ERR(rstc))
 		return dev_err_probe(&pdev->dev, PTR_ERR(rstc),
 				     "failed to get cpg reset\n");