arm64: dts: imx8qxp: Fix MU4_INT number

MU4_INT correct number is 180, while 179 is for MU3_INT.

Fixes: 3d91ba65 ("arm64: dts: imx: add imx8qxp support")
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8qxp.dtsi

@@ -350,7 +350,7 @@ lsio_mu3: mailbox@5d1e0000 {
 		lsio_mu4: mailbox@5d1f0000 {
 			compatible = "fsl,imx8qxp-mu", "fsl,imx6sx-mu";
 			reg = <0x5d1f0000 0x10000>;
-			interrupts = <GIC_SPI 179 IRQ_TYPE_LEVEL_HIGH>;
+			interrupts = <GIC_SPI 180 IRQ_TYPE_LEVEL_HIGH>;
 			#mbox-cells = <0>;
 			status = "disabled";
 		};