o Add support code for newer Marvell PHYs.

o Remove unused static global variable e1000phy_debug.
o Take advantage of mii_phy_dev_probe().
o Use MII_ANEGTICKS/MII_ANEGTICKS_GIGE instead of magic number 5.
o Add IFM_NONE as e1000phy(4) supports it without issues.
o Nuke magic PHY programming sequence in PHY reset and follow correct
  reset sequence. [1]
o Make manual media selection work for all supported media types.
o Don't set MIIF_NOISOLATE so e1000phy(4) can be used in
  configurations with multiple PHYs.
o In 1000baseT, when setting the link manually, one side must be the
  master and the other the slave. If LINK0 is set, program the PHY
  to be a master, otherwise it's a slave.
o When we lost a link, reset mii_ticks immediately so it correctly
  check number of seconds elapsed in autonegotiation phase.
o Announce link loss right after it happens.
o After kicking autonegotiation, report PHY status instead of
  returning immediatly.
o When link state check is in progress, check auto negotiation
  completion bit only when auto negotiation is enbaled.
o When PHY is resolved to a master, show it with IFM_FLAG2.

Special thanks to marius who fixed several nits in original patch.
In half-duplex mode, nfe(4) fails to send packets. I think it's a bug
in nfe(4) as the same PHY works without problems on msk(4).

Obtained from:	em(4) [1]
Reviewed by:	marius
Tested by:	bz

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