ARM: dts: at91: sama5d2: Add securam node

The sama5d2 has some static RAM that can be erased by the security module,
add its node
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/sama5d2.dtsi

@@ -735,6 +735,11 @@ pdmic_clk: pdmic_clk {
 						atmel,clk-output-range = <0 83000000>;
 					};
 
+					securam_clk: securam_clk {
+						#clock-cells = <0>;
+						reg = <51>;
+					};
+
 					i2s0_clk: i2s0_clk {
 						#clock-cells = <0>;
 						reg = <54>;
@@ -1059,6 +1064,15 @@ flx1: flexcom@f8038000 {
 				status = "disabled";
 			};
 
+			securam: sram@f8044000 {
+				compatible = "atmel,sama5d2-securam", "mmio-sram";
+				reg = <0xf8044000 0x1420>;
+				clocks = <&securam_clk>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+				ranges = <0 0xf8044000 0x1420>;
+			};
+
 			rstc@f8048000 {
 				compatible = "atmel,sama5d3-rstc";
 				reg = <0xf8048000 0x10>;