dts: sama5d2: add huk node for the NVMEM hardware unique key

Add the definition of the NVMEM HUK controller in the sama5d2
device tree.

Signed-off-by: Thomas Perrot <thomas.perrot@bootlin.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

core/arch/arm/dts/sama5d2.dtsi

@@ -750,6 +750,10 @@
 					reg = <0x0 0x4>;
 					bits = <0 7>;
 				};
+
+				sfc_dr0: cell@20 {
+					reg = <0x20 0x4>;
+				};
 			};
 
 			die_id: die_id {
@@ -758,6 +762,12 @@
 				nvmem-cell-names = "die_id";
 			};
 
+			huk: huk {
+				compatible = "optee,nvmem-huk";
+				nvmem-cells = <&sfc_dr0>;
+				nvmem-cell-names = "hw_unique_key";
+			};
+
 			i2s0: i2s@f8050000 {
 				compatible = "atmel,sama5d2-i2s";
 				reg = <0xf8050000 0x100>;