ARM: dts: keystone-k2g: Add keystone IRQ controller node

Add the Keystone IRQ controller IP node on K2G SoC. This allows the
ARM CorePac core to receive interrupts from remote processor devices
(eg: DSP) on the SoC.

The IP is identical in functionality to that of the equivalent
nodes on existing K2 SoCs. The only difference is the ARM INTC
interrupt id/event number.
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>

arch/arm/boot/dts/keystone-k2g.dtsi

@@ -98,5 +98,13 @@ uart0: serial@02530c00 {
 			clock-frequency = <200000000>;
 			status = "disabled";
 		};
+
+		kirq0: keystone_irq@026202a0 {
+			compatible = "ti,keystone-irq";
+			interrupts = <GIC_SPI 1 IRQ_TYPE_EDGE_RISING>;
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			ti,syscon-dev = <&devctrl 0x2a0>;
+		};
 	};
 };