ARM: sun7i: dt: Add Security System to A20 SoC DTS

The Security System is a hardware cryptographic accelerator that support
AES/MD5/SHA1/DES/3DES/PRNG algorithms.
It could be found on many Allwinner SoC.

This patch enable the Security System on the Allwinner A20 SoC Device-tree.
Signed-off-by: NLABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -731,6 +731,14 @@
 			status = "disabled";
 		};
 
+		crypto: crypto-engine@01c15000 {
+			compatible = "allwinner,sun4i-a10-crypto";
+			reg = <0x01c15000 0x1000>;
+			interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&ahb_gates 5>, <&ss_clk>;
+			clock-names = "ahb", "mod";
+		};
+
 		spi2: spi@01c17000 {
 			compatible = "allwinner,sun4i-a10-spi";
 			reg = <0x01c17000 0x1000>;