Avi Weiss created a merge request: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1211

Project:Branches: thnkslprpt/rtems:5553-tms570-printk-simplification to 
rtems/rtos/rtems:main
Author:   Avi Weiss



## Summary

Removes the unnecessary wait for `TX EMPTY` in the printk out path.

According to the documentation, `TXRDY` indicates the output buffer is ready to 
receive data.

This change saves a bit of time in `printk`'s but more so just removes an 
unnessesary check not required by the hardware.

Added some formatting clean-up and clearer documentation for the same file 
along with this MR.

Tested on TMS570 LC43.

## Generative AI

None

Fixes #5553

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1211
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