SOLARIS: Reorder definitions for vnode callbacks

SOLARIS: Reorder definitions for vnode callbacks

Currently, many of the functions for our vnode ops are
forward-declared, right before they are referenced in the relevant
vnop template array. Move the function definitions to before the
references, so we can simply get rid of the forward declarations.

These functions are also all only referenced in this file, so declare
them 'static'.

Change-Id: Icd82b6d6176342e2576ce333b40c4b79e8c692c1
Reviewed-on: https://gerrit.openafs.org/12693
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Marcio Brito Barbosa <mbarbosa@sinenomine.net>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: Mark Vitale <mvitale@sinenomine.net>