Make some tweaks to the RealTek driver:

- Fix a bug in rl_rxeof() handler: in the case where the packet wraps
  from the end of the receive buffer back to the beginning, we need to
  insure that at least sizeof(ether_header) bytes make it into the first
  mbuf. If we don't, then doing eh = mtod(m, struct ether_header *)
  loses. To avoid this, we use m_pullup() to suck at least MHLEN -
  RL_ETHER_ALIGN bytes into the first mbuf, which should also help
  small packets fit into a single mbuf.

  Pointed out by: Philip A. Prindeville <philipp@zembu.com>

- Make the transmit threshold autotuning: start off with a small value
  and jack it up when TX underruns are detected.

- Also improve TX error recovery: kick the chip in the head with a
  reset/init sequence to make sure it recovers afer a transmit error.

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