ARM: shmobile: r8a7779: add irqpin default status on DTSI

r8a7779 INTC needs IRL pin mode settings to determine
behavior of IRQ0 - IRQ3. But it depends on platform.
This patch adds status = "disabled" on r8a7779.dtsi as default
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7779.dtsi

@@ -135,6 +135,7 @@ gpio6: gpio@ffc46000 {
 	irqpin0: irqpin@fe780010 {
 		compatible = "renesas,intc-irqpin";
 		#interrupt-cells = <2>;
+		status = "disabled";
 		interrupt-controller;
 		reg = <0xfe78001c 4>,
 			<0xfe780010 4>,