afs: Remove AFS_BOZONLOCK_ENV

The only user of AFS_BOZONLOCK_ENV is ppc_darwin_80.  This was added
to the param file by commit:

    commit 379e3be3196aeb3fefaa1e9296e52a9f8018550a
    Author: Derrick Brashear <shadow@dementia.org>
    Date:   Sun Jun 19 00:20:01 2005 +0000

        ppc-darwin80-20050618

        this is actually a throwaway

It isn't clear to me what the intent was.  Darwin clearly isn't
using the Bozon lock around every osi_FlushPages() despite comments
in DARWIN/osi_vnodeops.c about said lock.   The possibility of the
Bozon lock being required only ppc_darwin_80 and not ppc_darwin_70 and
ppc_darwin_90 is unlikely.

The comments about the Bozon lock in FBSD/osi_vnodeops.c appears to be
a copy/paste from DARWIN's.  Curiously, FBSD doesn't drop the GLOCK()
when osi_FlushPages() calls osi_VM_FlushPages() despite a comment to
the contrary in osi_VM_FlushPages().

Also, instead of editing the alpha_dux param files, just remove them.
Nothing is using them.

Change-Id: Ic1f6aabd82b9bd3686c95fd501a9d72163595421
Reviewed-on: http://gerrit.openafs.org/11108
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>