[netdrvr e1000] 82547 interrupt assert/de-assert re-ordering

[netdrvr e1000] 82547 interrupt assert/de-assert re-ordering

* 82547 needs interrupt disable/enable to keep interrupt assertion
  state synced between 82547 and APIC.  82547 will re-order
  assert and de-assert messages if hub link bus is busy (heavy
  traffic).  Disabling interrupt on device works around re-
  order issue.  Note: this is a re-patch.  We backed out the
  patch because of a report on a system with a 8086:1019 device
  would lock up with this patch.  Turns out that system was a
  pre-production sample.