e1000: Recover from the 82574 PHY hangHEADmain

The shared code provides e1000_check_phy_82574() to recognize a PHY
hang from saturated receive error and idle error counters, but em(4)
never calls it.

Run the check from timer driven admin work.  Match Intel e1000e by
requiring two consecutive positive samples before requesting a full
iflib reset.

MFC after:	2 weeks
Sponsored by:	BBOX.io

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