afs: Remove unused constant DCSIZE

afs: Remove unused constant DCSIZE

The size of the dcache hash table is automatically determined
from the size of the vcache hash table size, since even before
the initial OpenAFS 1.0 release.  AFS 3.3 had constants
DCHASHSIZE and DVHASHSIZE which were used to size the respective
hash tables, but DCSIZE was unused even there.

Change-Id: I1f4e278eacb881b60a457fa9871225de7ce0f9f8
Reviewed-on: http://gerrit.openafs.org/11672
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Perry Ruiter <pruiter@sinenomine.net>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>