ee(1): Remove two unused files.
kernel - Attempt to fix shared/excl namecache deadlock

* Attempt to fix a shared/excl namecache deadlock where the shared lock
  may block excessively waiting for other shared users to unlock when
  an exclusive request is pending.

* Do a better job reporting the time delayed when blocked for an
  excessive period of time.
<sys/device.h>: Fix a typo in an extern declaration.