arm64: dts: marvell: Add definition of SPI controller for Armada 3700

Armada 3700 SoC has an SPI Controller, this commit adds the definition
of the SPI device node at the SoC level.
Signed-off-by: NRomain Perier <romain.perier@free-electrons.com>
Tested-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-37xx.dtsi

@@ -98,6 +98,17 @@
 			/* 32M internal register @ 0xd000_0000 */
 			ranges = <0x0 0x0 0xd0000000 0x2000000>;
 
+			spi0: spi@10600 {
+				compatible = "marvell,armada-3700-spi";
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0x10600 0xA00>;
+				clocks = <&nb_periph_clk 7>;
+				interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
+				num-cs = <4>;
+				status = "disabled";
+			};
+
 			uart0: serial@12000 {
 				compatible = "marvell,armada-3700-uart";
 				reg = <0x12000 0x400>;