ARM: shmobile: lager dts: Add da9210 regulator interrupt

The da9210 regulator is connected to IRQ2. Reflect this in its device
node, so the driver can use it when it gains interrupt support.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7790-lager.dts

@@ -516,6 +516,8 @@
 	vdd_dvfs: regulator@68 {
 		compatible = "dlg,da9210";
 		reg = <0x68>;
+		interrupt-parent = <&irqc0>;
+		interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
 
 		regulator-min-microvolt = <1000000>;
 		regulator-max-microvolt = <1000000>;