RTEMS | bsps/powerpc/motorola_powerpc/README.md: Update networking info (dec21140) (#5085)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5085



The following discussion from !157 should be addressed:

- [ ] @joel started a [discussion](https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/157#note_110351): 

    >  Networking is no longer in the tree. Rewrite to mention support in rtems-legacy and rtems-libbsd.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5085
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