ARM: dts: lpc32xx: describe FLASH_INT of SLC NAND controller

SLC and MLC NAND flash controllers fire the muxed interrupt FLASH_INT to
the SoC, add the interrupt property to the SLC device tree node.

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

Author: vzapolskiy

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

@@ -65,6 +65,7 @@
 		slc: nand-controller@20020000 {
 			compatible = "nxp,lpc3220-slc";
 			reg = <0x20020000 0x1000>;
+			interrupts = <11 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&clk LPC32XX_CLK_SLC>;
 			status = "disabled";
 		};