staging: lustre: uapi: remove unused functions for lustre_fid.h

The inline function fid_is_namespace_visible and ost_fid_from_resid
are only used for server code so we can remove it.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>