MFC r218833,218964:

MFC r218833,218964:
r218833:
  Count how many frames driver lost in interrupt handler. This
  register is cleared on read so make sure to clear it in driver
  initialization phase.

r218964:
  Remove unnecessary controller reinitialization which resulted in
  link flips during alias address insertion or dhclient operation.
  While I'm here remove dc_reset() in DC_ISR_BUS_ERR case. Device is
  fully reinitialized again in dc_init_locked().

git-svn-id: svn://svn.freebsd.org/base/stable/8@220074 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f