net: macb: Perform zynqmp dynamic configuration only for SGMII interface

In zynqmp platforms where firmware supports dynamic SGMII configuration
but has other non-SGMII ethernet devices, it fails them with no packets
received at the RX interface.

To fix this behaviour perform SGMII dynamic configuration only
for the SGMII phy interface.

Fixes: 32cee781 ("net: macb: Add zynqmp SGMII dynamic configuration support")
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reported-by: Michal Simek <michal.simek@amd.com>
Tested-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1675340779-27499-1-git-send-email-radhey.shyam.pandey@amd.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/cadence/macb_main.c

@@ -4627,7 +4627,6 @@ static int init_reset_optional(struct platform_device *pdev)
 		if (ret)
 			return dev_err_probe(&pdev->dev, ret,
 					     "failed to init SGMII PHY\n");
-	}
 
 		ret = zynqmp_pm_is_function_supported(PM_IOCTL, IOCTL_SET_GEM_CONFIG);
 		if (!ret) {
@@ -4648,6 +4647,8 @@ static int init_reset_optional(struct platform_device *pdev)
 				goto err_out_phy_exit;
 		}
 
+	}
+
 	/* Fully reset controller at hardware level if mapped in device tree */
 	ret = device_reset_optional(&pdev->dev);
 	if (ret) {