arm64: dts: imx8mq-librem5: Add interrupt-names to ti,tps6598x

The ti,tps6598x binding requires interrupt-names property.  The driver
does not really use it but the hardware could have more interrupt lines
connected.  This fixes dtbs_check warning:

  arch/arm64/boot/dts/freescale/imx8mq-librem5-r2.dt.yaml: usb-pd@3f: 'interrupt-names' is a required property
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi

@@ -605,6 +605,7 @@
 		pinctrl-0 = <&pinctrl_typec>, <&pinctrl_tcpc>;
 		interrupt-parent = <&gpio1>;
 		interrupts = <10 IRQ_TYPE_LEVEL_LOW>;
+		interrupt-names = "irq";
 
 		connector {
 			ports {