RTEMS | cpukit/rtems-fdt: test and fix index search by offset (!1279)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1279

Project:Branches: gedare/rtems:5606-search-index to rtems/rtos/rtems:main
Author:   Gedare Bloom
Assignee: Gedare Bloom


## Summary

cpukit/rtems-fdt: test and fix index search by offset

The rtems_fdt_subnode_offset and rtems_fdt_get_name try to binary
search the entries index by the DTB offset, but the index is sorted
by alphabetically by the name, so the search is broken. Replace these
searches by directly calling the libfdt functions. Since the DTB offset
is known, the performance hit for invoking the libfdt should not be too
much.

Closes #5606.


## Generative AI
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Closes #5606

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1279
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