arm64: dts: imx8mq-librem5-devkit: Don't use underscore in node name

Rename usb_typec to usb-typec to get a rid of a warning when building
dtb with warnings enabled.
Signed-off-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

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

@@ -410,7 +410,7 @@ ldo7_reg: LDO7 {
 		};
 	};
 
-	typec_ptn5100: usb_typec@52 {
+	typec_ptn5100: usb-typec@52 {
 		compatible = "nxp,ptn5110";
 		reg = <0x52>;
 		pinctrl-names = "default";