ARM: dts: exynos: Add missing PMIC interrupts on UniversalC210 board

PMIC node requires external interrupts for proper operation. Lack of them
was probably caused by a limited support for interrupts from more than one
parent, which was not possible to define when support for this board was
added. Fix this by adding 'interrupt-extended' property and properly
define both interrupt lines for PMIC node.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/exynos4210-universal_c210.dts

@@ -310,6 +310,9 @@ vdd_arm_reg: pmic@60 {
 
 	pmic@66 {
 		compatible = "national,lp3974";
+		interrupts-extended = <&gpx0 7 0>, <&gpx2 7 0>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&lp3974_irq>;
 		reg = <0x66>;
 
 		max8998,pmic-buck1-default-dvs-idx = <0>;
@@ -503,6 +506,11 @@ port@0 {
 };
 
 &pinctrl_1 {
+	lp3974_irq: lp3974-irq {
+		samsung,pins = "gpx0-7", "gpx2-7";
+		samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
+	};
+
 	hdmi_hpd: hdmi-hpd {
 		samsung,pins = "gpx3-7";
 		samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;