RTEMS | samples: Add "Hey! Listen!" greeting to hello world for GSoC (!446)

[Touran Mahmud (@touro)]

Touran Mahmud created a merge request: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/446

Project:Branches: touro/rtems:hello-world to rtems/rtos/rtems:main
Author:   Touran Mahmud




## Summary

Modified the print statement to the hello world example to demonstrate making 
changes to RTEMS code for GSoC verification. Attached is the screenshot that 
prints the statement.

![rtems-screenshot](/uploads/314ff66734f17da24f65ca8e72cf9d7d/rtems-screenshot.png)


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https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/446
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