ARM: dts: NSP: MX6X: get mac-address from eeprom

The MAC address on the MX64/MX65 series is located on the AT24 EEPROM.
This is the same as other Meraki devices such as the MR32 [1].

[1] https://lore.kernel.org/linux-arm-kernel/[e-mail]/

Signed-off-by: Matthew Hagan <[e-mail]>
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/bcm958625-meraki-mx6x-common.dtsi

···
 
 &amac2 {
 	status = "okay";
+	nvmem-cells = <&mac_address>;
+	nvmem-cell-names = "mac-address";
 };
 
 &ehci0 {
···
 		reg = <0x50>;
 		pagesize = <32>;
 		read-only;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		mac_address: mac-address@66 {
+			reg = <0x66 0x6>;
+		};
 	};
 };