please refer to the jetson AGX Xavier adaptation guide document to know how to add extcon nodes to your device tree.
https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-3261/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/adaptation_and_bringup.html#
Only AGX Xavier document has the example of type C controller.