ARM64: dts: marvell: armada-37xx: Fix interrupt mapping for USB3

IRQ number for xhci controller was wrong, fix it.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-37xx.dtsi

@@ -200,7 +200,7 @@ usb3: usb@58000 {
 				compatible = "marvell,armada3700-xhci",
 				"generic-xhci";
 				reg = <0x58000 0x4000>;
-				interrupts = <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>;
+				interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
 				status = "disabled";
 			};