microchipsw: backport MDIO probe defferal silencing

Currently, MDIO driver will print the probe defferal as error.
So, instead of spaming the log, backport the upstream fix for it.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>

Author: robimarko

target/linux/microchipsw/patches-6.18/0001-v7.2-net-phy-micrel-use-dev_err_probe.patch

@@ -0,0 +1,30 @@
+From 65d6d1fa50933a056305ba3f743dfb9d74cead39 Mon Sep 17 00:00:00 2001
+From: Robert Marko <robert.marko@sartura.hr>
+Date: Fri, 15 May 2026 14:05:40 +0200
+Subject: [PATCH] net: phy: micrel: use dev_err_probe()
+
+Currently, during probe defferal the driver will print multiple times:
+mscc-miim e20101a8.mdio: Cannot register MDIO bus (-517)
+
+So, lets silence that by using the dev_err_probe() for printing the probe
+error as it handles probe defferal.
+
+Signed-off-by: Robert Marko <robert.marko@sartura.hr>
+Reviewed-by: Andrew Lunn <andrew@lunn.ch>
+Link: https://patch.msgid.link/20260515120608.706361-1-robert.marko@sartura.hr
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/mdio/mdio-mscc-miim.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/net/mdio/mdio-mscc-miim.c
++++ b/drivers/net/mdio/mdio-mscc-miim.c
+@@ -330,7 +330,7 @@ static int mscc_miim_probe(struct platfo
+ 
+ 	ret = of_mdiobus_register(bus, np);
+ 	if (ret < 0) {
+-		dev_err(dev, "Cannot register MDIO bus (%d)\n", ret);
++		dev_err_probe(dev, ret, "Cannot register MDIO bus\n");
+ 		goto out_disable_clk;
+ 	}
+