UART4 Enable

Robotics & Edge Computing Jetson Systems Jetson AGX Orin
6

I also tried to add an alias as per this forum:
https://forums.developer.nvidia.com/t/issue-with-enabling-uartb-serial-3110000-on-orin-nx-with-l4t-36-3/297052/3?u=matthew196

but also not picking up any other THS ports.