NFSD: Remove '#include "xdr.h"' from fs/nfsd/xdr3.h

Separate the dependencies between fs/nfsd/xdr3.h and fs/nfsd/xdr.h
so that NFSD's NFSv2 and NFSv3 implementations can be converted
independently to use xdrgen.

The only reason xdr3.h includes xdr.h is to pick up the definition
of struct nfsd_fhandle. xdr3.h does not name the structure itself;
its consumers nfs3proc.c and nfs3xdr.c do, reaching the definition
through xdr3.h. That structure wraps a single struct svc_fh, which
is defined in nfsfh.h, a header both xdr.h and xdr3.h already include
via vfs.h. Move struct nfsd_fhandle next to svc_fh in nfsfh.h so the
two XDR headers share one definition and xdr3.h no longer depends on
xdr.h. nfs2acl.c, which includes both headers, then sees that single
definition instead of a clashing pair.

Stripping xdr.h to its own dependencies also removes the
transitive route by which nfsxdr.c and nfs3xdr.c reached nfsd.h.
Both expand the nfserr_* and nfs_ok status-code macros that
nfsd.h defines, so each gains a direct #include of nfsd.h in
place of the one xdr.h used to supply.

As a clean-up, the #includes at the top of both header files are
made the same.

Acked-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260916162859.2051-7-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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