arm: dts: lpc32xx: add interrupts property to Motor Control PWM

Motor Control PWM shares an interrupt line with TIMER4 on MIC interrupt
controller, the interrupt serves as period (timer limit), pulse-width (match)
and capture event interrupt.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>

Author: vzapolskiy

arch/arm/boot/dts/nxp/lpc/lpc32xx.dtsi

@@ -322,6 +322,7 @@
 			mpwm: pwm@400e8000 {
 				compatible = "nxp,lpc3220-motor-pwm";
 				reg = <0x400e8000 0x78>;
+				interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
 				clocks = <&clk LPC32XX_CLK_MCPWM>;
 				#pwm-cells = <3>;
 				status = "disabled";