[Silabs]Clarify a warning trace for brd4186a/87c and cleanup unsupported erro…#29740

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mergify[bot] merged 2 commits intoproject-chip:masterfrom jmartinez-silabs:clarify_deprecated

Oct 13, 2023

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Commits on Oct 13, 2023

Clarify a warning trace for brd4186a/87c and cleanup unsupported error message
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