ARM: dts: mps2: use list instead of tuple for uart interrupts

MPS2 UART requires dedicated interrupts for RX, TX and overflow, which
obviously should be expressed as a list. Current form uses tuple and
it has worked so far because NVIC has interrupt-cells equal to 1.

Signed-off-by: Vladimir Murzin <[e-mail]>
Signed-off-by: Sudeep Holla <[e-mail]>

arch/arm/boot/dts/mps2.dtsi

···
 			uart0: serial@4000 {
 				compatible = "arm,mps2-uart";
 				reg = <0x4000 0x1000>;
-				interrupts = <0 1 12>;
+				interrupts = <0>, <1>, <12>;
 				clocks = <&sysclk>;
 				status = "disabled";
 			};
···
 			uart1: serial@5000 {
 				compatible = "arm,mps2-uart";
 				reg = <0x5000 0x1000>;
-				interrupts = <2 3 12>;
+				interrupts = <2>, <3>, <12>;
 				clocks = <&sysclk>;
 				status = "disabled";
 			};
···
 			uart2: serial@6000 {
 				compatible = "arm,mps2-uart";
 				reg = <0x6000 0x1000>;
-				interrupts = <4 5 12>;
+				interrupts = <4>, <5>, <12>;
 				clocks = <&sysclk>;
 				status = "disabled";
 			};