[Silabs] Merge PlatformManagerImpl.cpp for efr32 and si917 platforms#33274

Merged

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

May 3, 2024

+17-182

Commits on May 2, 2024

Merge PlatformManagerImpl.cpp for efr32 and si917 platforms as they were mostly the same
jmartinez-silabs
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add a nullptr check
jmartinez-silabs
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