ARM: dts: odroidxu3: Enable wake alarm of S2MPS11 RTC

The IRQB of S2MPS11 PMIC is wired to XEINT4 (GPX0-4) through pull-up
resistor.

Add interrupt properties and pinctrl configuration to enable RTC wake
alarm of rtc-s5m driver. This also removes a warning:
sec_pmic 4-0066: No interrupt specified, no interrupts
Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/exynos5422-odroidxu3.dts

@@ -12,6 +12,7 @@
 
 /dts-v1/;
 #include <dt-bindings/clock/samsung,s2mps11.h>
+#include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/sound/samsung-i2s.h>
 #include "exynos5800.dtsi"
@@ -153,6 +154,11 @@ s2mps11_pmic@66 {
 		s2mps11,buck3-ramp-enable = <1>;
 		s2mps11,buck4-ramp-enable = <1>;
 
+		interrupt-parent = <&gpx0>;
+		interrupts = <4 IRQ_TYPE_EDGE_FALLING>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&s2mps11_irq>;
+
 		s2mps11_osc: clocks {
 			#clock-cells = <1>;
 			clock-output-names = "s2mps11_ap",
@@ -464,6 +470,13 @@ hdmi_hpd_irq: hdmi-hpd-irq {
 		samsung,pin-pud = <1>;
 		samsung,pin-drv = <0>;
 	};
+
+	s2mps11_irq: s2mps11-irq {
+		samsung,pins = "gpx0-4";
+		samsung,pin-function = <0xf>;
+		samsung,pin-pud = <0>;
+		samsung,pin-drv = <0>;
+	};
 };
 
 &pinctrl_1 {