ARM: shmobile: Use r8a7790 suffix for IRQC compat string

Add "renesas,irqc-r8a7790" to the compatible string for IRQC
in case of r8a7790. This makes the IRQC follow the same style
as the other devices and also makes it more future proof.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/arch/arm/boot/dts/r8a7790.dtsi b/arch/arm/boot/dts/r8a7790.dtsi
index fb9225f..0e4d5b5 100644
--- a/arch/arm/boot/dts/r8a7790.dtsi
+++ b/arch/arm/boot/dts/r8a7790.dtsi
@@ -178,7 +178,7 @@
 	};
 
 	irqc0: interrupt-controller@e61c0000 {
-		compatible = "renesas,irqc";
+		compatible = "renesas,irqc-r8a7790", "renesas,irqc";
 		#interrupt-cells = <2>;
 		interrupt-controller;
 		reg = <0 0xe61c0000 0 0x200>;