ARM: shmobile: armadillo-reference: Use low level IRQ for ST1231

The device is configured to generate an active-low interrupt signal that
needs to be acknowledged by the host. Configure the IRQ to trigger on
low level.
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

@@ -95,7 +95,7 @@ touchscreen@55 {
 		compatible = "sitronix,st1232";
 		reg = <0x55>;
 		interrupt-parent = <&irqpin1>;
-		interrupts = <2 IRQ_TYPE_NONE>; /* IRQ10: hwirq 2 on irqpin1 */
+		interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
 		pinctrl-0 = <&st1232_pins>;
 		pinctrl-names = "default";
 		gpios = <&pfc 166 GPIO_ACTIVE_LOW>;