ARM: dts: mmp*: Fix up encoding of the /rtc interrupts property

This way the device tree validator learns that each cell of the property
constitutes a separate item. Otherwise it gets unnecessairly upset:

  mmp3-dell-ariel.dt.yaml: rtc@d4010000: interrupts: [[1, 0]] is too short
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/mmp2.dtsi

@@ -364,7 +364,7 @@ twsi6: i2c@d4034000 {
 			rtc: rtc@d4010000 {
 				compatible = "mrvl,mmp-rtc";
 				reg = <0xd4010000 0x1000>;
-				interrupts = <1 0>;
+				interrupts = <1>, <0>;
 				interrupt-names = "rtc 1Hz", "rtc alarm";
 				interrupt-parent = <&intcmux5>;
 				clocks = <&soc_clocks MMP2_CLK_RTC>;

arch/arm/boot/dts/mmp3.dtsi

@@ -474,7 +474,7 @@ twsi6: i2c@d4034000 {
 			rtc: rtc@d4010000 {
 				compatible = "mrvl,mmp-rtc";
 				reg = <0xd4010000 0x1000>;
-				interrupts = <1 0>;
+				interrupts = <1>, <0>;
 				interrupt-names = "rtc 1Hz", "rtc alarm";
 				interrupt-parent = <&rtc_mux>;
 				clocks = <&soc_clocks MMP2_CLK_RTC>;