ARM: dts: imx6sx: fix irq for pcie bridge

Use the correct IRQ line for the MSI controller in the PCIe host
controller. Apparently a different IRQ line is used compared to other
i.MX6 variants. Without this change MSI IRQs aren't properly propagated
to the upstream interrupt controller.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Fixes: b1d17f68 ("ARM: dts: imx: add initial imx6sx device tree source")
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sx.dtsi

@@ -1344,7 +1344,7 @@ pcie: pcie@8ffc000 {
 			ranges = <0x81000000 0 0          0x08f80000 0 0x00010000 /* downstream I/O */
 				  0x82000000 0 0x08000000 0x08000000 0 0x00f00000>; /* non-prefetchable memory */
 			num-lanes = <1>;
-			interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
+			interrupts = <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "msi";
 			#interrupt-cells = <1>;
 			interrupt-map-mask = <0 0 0 0x7>;