ARM: dts: keystone-k2e: fix mdio io start address

The K2E MDIO io space has different start address.
Hence, fix it to be 0x24200f00 according to TRM.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

arch/arm/boot/dts/k2e.dtsi

@@ -87,3 +87,7 @@ dspgpio0: keystone_dsp_gpio@02620240 {
 		};
 	};
 };
+
+&mdio {
+	reg = <0x24200f00 0x100>;
+};