ARM: dts: alpine: add the MSIX node

With the newly available MSIX driver for Alpine, add the corresponding
node in the Alpine device tree.

Signed-off-by: Antoine Tenart <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/arm/boot/dts/alpine.dtsi

···
 			ranges = <0x02000000 0x0 0xfe000000 0x0 0xfe000000 0x0 0x1000000>;
 
 			bus-range = <0x00 0x00>;
+			msi-parent = <&msix>;
+		};
+
+		msix: msix@fbe00000 {
+			compatible = "al,alpine-msix";
+			reg = <0x0 0xfbe00000 0x0 0x100000>;
+			interrupt-controller;
+			msi-controller;
+			al,msi-base-spi = <96>;
+			al,msi-num-spis = <64>;
 		};
 	};
 };