MFC r204545:

MFC r204545:
  Remove taskqueue based interrupt handling. After r204541 msk(4)
  does not generate excessive interrupts any more so we don't need
  to have two copies of interrupt handler.
  While I'm here remove two STAT_PUT_IDX register accesses in LE
  status event handler. After r204539 msk(4) always sync status LEs
  so there is no need to resort to reading STAT_PUT_IDX register to
  know the end of status LE processing. Just trust status LE's
  ownership bit.

git-svn-id: svn://svn.freebsd.org/base/stable/8@205613 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f