nuttx: h7: eth: add checks for PHYID in stm32_phyinit #24348
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Summary
Check PHYID1 and PHYID2 for the configured PHY during init.
Impact
Fixes bug where stm32_phyinit will succeed even when no PHY is connected. This is because there is no check that a PHY is actually communicating and returning data.
See apache/nuttx#15757