Alas, I badly write in English :(. If it is unclear that I tried to explain, then attentively you watch video to the offered link (Build Kernel - NVIDIA Jetson TX1 - YouTube) from 2:58 till 2:59, you need to make also only for a line with USB CP210X family of UART…
Also pay attention that in the files offered *.sh links to specific versions of kernel are specified, you need or to use the same kernel version on jetson tx1, or to comment out and change lines of loading of kernel to the version which is used at you on jetson TX1. On your question on FTDI - I didn’t change setup on it.