ARM: dts: bcm6846: Add MDIO control block

This adds the MDIO block found in the BCM6846. Use the new
"brcm,bcm6846-mdio" compatible (merged to the networking tree)
for this block.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20241019-genexis-xg6846b-base-v3-4-8375a0e1f89f@linaro.org
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>

Author: Linus Walleij

arch/arm/boot/dts/broadcom/bcm6846.dtsi

@@ -223,5 +223,14 @@
 				reg = <0>;
 			};
 		};
+
+		mdio: mdio@2060 {
+			compatible = "brcm,bcm6846-mdio";
+			reg = <0x02060 0x10>, <0x5a068 0x4>;
+			reg-names = "mdio", "mdio_indir_rw";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+		};
 	};
 };