Added optional port flag to script to extend flexiability.

[luyaohan1001]

In my setup openocd starts by default on telnet port 50001. <img width="950" alt="Pasted Graphic 16" src="https://github.com/user-attachments/assets/c88cbf17-347a-4eee-b18c-7092dc24adf2”>

I added an optional flag to above script so the port could be specified on run time.

I am using above script for RTOS tracing based on Instrumentation Macrocell: https://github.com/luyaohan1001/YesRTOS