ARM: dts: keystone: add keystone irq controller node

Add Keystone IRQ controller IP node which allows ARM
CorePac core to receive signals from DSP cores.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

arch/arm/boot/dts/keystone.dtsi

@@ -277,5 +277,13 @@ mdio: mdio@02090300 {
 			clock-names = "fck";
 			bus_freq	= <2500000>;
 		};
+
+		kirq0: keystone_irq@26202a0 {
+			compatible = "ti,keystone-irq";
+			interrupts = <GIC_SPI 4 IRQ_TYPE_EDGE_RISING>;
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			ti,syscon-dev = <&devctrl 0x2a0>;
+		};
 	};
 };