viced: remove obsolete comment about alignment

viced: remove obsolete comment about alignment

Alignment may have been historically relevant, but is no longer.
Remove the comment.

Also remove the unneeded 'dummy' field which does not provide
padding for a useful alignment.

Change-Id: I447fb73c379e6f86facd955a29ffd80e8929ceff
Reviewed-on: http://gerrit.openafs.org/11289
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Perry Ruiter <pruiter@sinenomine.net>
Reviewed-by: D Brashear <shadow@your-file-system.com>