ARM: dts: imx53-voipac-dmm-668: Use IRQ_TYPE specifier

Replace magic number with the proper IRQ_TYPE specifier to improve DT
readability.
Signed-off-by: Hernán Gonzalez <hernan@vanguardiasur.com.ar>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx53-voipac-dmm-668.dtsi

@@ -150,7 +150,7 @@ pmic: dialog@48 {
 		compatible = "dlg,da9053-aa", "dlg,da9052";
 		reg = <0x48>;
 		interrupt-parent = <&gpio7>;
-		interrupts = <11 0x8>; /* low-level active IRQ at GPIO7_11 */
+		interrupts = <11 IRQ_TYPE_LEVEL_LOW>; /* low-level active IRQ at GPIO7_11 */
 
 		regulators {
 			buck1_reg: buck1 {