After a successful auto-negotiation, pic32mz_phyinit() called
pic32mz_phymode() with the negotiated speed and duplex. That function
clears MII_MCR_ANENABLE, so the PHY stayed in a forced mode. The link
keeps working until the cable is removed, but on reconnection the PHY
no longer negotiates and, against an auto-negotiating partner, the link
stays down (seen with a LAN8720A: MCR 0x2100, MSR without link status).
Only force the mode when CONFIG_PIC32MZ_PHY_AUTONEG is not selected.
Assisted-by: Claude Code:claude-opus-5-5
Signed-off-by: Daniel P. Carvalho <danieloak@gmail.com>
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