NFSD: Move struct readdir_cd

struct readdir_cd is part of the VFS readdir API, but it lives in
nfsd.h, the subsystem's catch-all header, rather than alongside that
API. That forces vfs.h to include nfsd.h solely to declare readdir_cd
for its nfsd_readdir() prototype, a layering inversion since vfs.h is
the lower-level shim.

Relocate readdir_cd to vfs.h, just below the nfsd_filldir_t callback
typedef. vfs.h then defines the struct itself and no longer includes
nfsd.h. The xdr headers that embed readdir_cd by value include vfs.h
to obtain the definition. This prepares the ground for dropping nfsd.h
from more files.

Link: https://patch.msgid.link/20260712204554.125308-7-cel@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <cel@kernel.org>

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