arm64: boot: xilinx: add fixed-layout nvmem

The support of adding nvmem cells directly to the memory node
is being removed in the future and has to be explicitly specified
in driver  nvmem configuration. By default, nvmem only adds cells
from fixed-layout node. Added fixed layout node in the i2c eeprom
to support loading MAC address from eeprom.

Signed-off-by: Ramona Alexandra Nechita <ramona.nechita@analog.com>
(cherry picked from commit f9e9b06)

Author: ranechita

arch/arm64/boot/dts/xilinx/zynqmp-jupiter-sdr.dtsi

@@ -296,11 +296,15 @@
 		compatible = "atmel,24c16";
 		pagesize = <16>;
 		reg = <0x50>;
-		#address-cells = <1>;
-		#size-cells = <1>;
 
-		eth0_addr: eth-mac-addr@B {
-			reg = <0xB 0x06>;
+		nvmem-layout {
+			compatible = "fixed-layout";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			eth0_addr: eth-mac-addr@B {
+				reg = <0xB 0x06>;
+			};
 		};
 	};