ena: move hw stats updating routine to separate task
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Authored by mk_semihalf.com on May 26 2017, 10:51 AM.

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rS319200: Move ENA's hw stats updating routine to separate task

Summary

Initially, stats were being updated each time OS was requesting for
first statistic.
To read statistics from hw, condvar was used. cv_timedwait cannot be
called when unsleepable lock is held, and this happens when FreeBSD
is requesting statistic.
Separate task is reading statistics from NIC each 1 second.