ARM: shmobile: armadillo-reference: Add st1232 pin mappings

Add pin mappings for the st1232 device to the device tree and reference
them as the default state for the device.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7740-armadillo800eva-reference.dts

@@ -41,6 +41,8 @@
 		reg = <0x55>;
 		interrupt-parent = <&irqpin1>;
 		interrupts = <2 0>; /* IRQ10: hwirq 2 on irqpin1 */
+		pinctrl-0 = <&st1232_pins>;
+		pinctrl-names = "default";
 	};
 };
 
@@ -52,4 +54,9 @@
 		renesas,groups = "scifa1_data";
 		renesas,function = "scifa1";
 	};
+
+	st1232_pins: st1232 {
+		renesas,groups = "intc_irq10";
+		renesas,function = "intc";
+	};
 };