Ok, _really_ fix the Intel 2100B Centrino deadlock problems this time.

(I hope.)

My original instinct to make ndis_return_packet() asynchronous was correct.
Making ndis_rxeof() submit packets to the stack asynchronously fixes
one recursive spinlock acquisition, but it's also possible for it to
happen via the ndis_txeof() path too. So:

- In if_ndis.c, revert ndis_rxeof() to its old behavior (and don't bother
  putting ndis_rxeof_serial() back since we don't need it anymore).

- In kern_ndis.c, make ndis_return_packet() submit the call to the
  MiniportReturnPacket() function to the "ndis swi" thread so that
  it always happens in another context no matter who calls it.

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