afs: eliminate INSTRUMENT_LOCKS

afs: eliminate INSTRUMENT_LOCKS

Since the original IBM code import, there have been two versions of the
lock macros: one with INSTRUMENT_LOCKS (the default) and one without.
Only the former is ever enabled.  Therefore, remove the unused latter
versions, and all INSTRUMENT_LOCKS conditional logic.

No functional change is incurred by this commit.

Change-Id: I154cd07e81ce7e9a2cc1bb4f0f93615de921e199
Reviewed-on: https://gerrit.openafs.org/14716
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>