- Use callout_init_mtx() to close races between hme_stop() and hme_tick(). - Use the driver lock instead of Giant in a bus dma callback. - Clear IFF_DRV_(RUNNING|OACTIVE) in hme_stop() instead of just clearing   RUNNING in hme_ioctl() to be more like other ethernet drivers. - Lock the driver lock around mii operations. - Remove spls. - Cleanup locking in hme_ioctl().
- Use callout_init_mtx() to close races between hme_stop() and hme_tick().
- Use the driver lock instead of Giant in a bus dma callback.
- Clear IFF_DRV_(RUNNING|OACTIVE) in hme_stop() instead of just clearing
  RUNNING in hme_ioctl() to be more like other ethernet drivers.
- Lock the driver lock around mii operations.
- Remove spls.
- Cleanup locking in hme_ioctl().

MFC after:	1 week

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