MFC to RELENG_6:   Move "1000baseT" from IFM_SUBTYPE_ETHERNET_DESCRIPTIONS to   IFM_SUBTYPE_ETHERNET_ALIASES: there is already "1000baseTX" in   IFM_SUBTYPE_ETHERNET_DESCRIPTIONS.  This doesn't change ifconfig   behaviour.
MFC to RELENG_6:
  Move "1000baseT" from IFM_SUBTYPE_ETHERNET_DESCRIPTIONS to
  IFM_SUBTYPE_ETHERNET_ALIASES: there is already "1000baseTX" in
  IFM_SUBTYPE_ETHERNET_DESCRIPTIONS.  This doesn't change ifconfig
  behaviour.

  PR:             45793 (maybe)
  Approved by:    rwatson (mentor)
  MFC after:      1 month

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