NFSD: Use struct knfsd_fh in struct pnfs_ff_layout

The file handle held in struct pnfs_ff_layout is copied directly out
of a struct svc_fh, whose fh_handle member is a struct knfsd_fh.
Storing the layout's copy as struct nfs_fh instead forced an
open-coded field-by-field copy between two unrelated structures.

Hold the layout's file handle in struct knfsd_fh so the copy uses the
canonical fh_copy_shallow() helper and server code no longer reaches
into a separate file handle representation.

Cc: Thomas Haynes <loghyr@hammerspace.com>
Link: https://patch.msgid.link/20260720141442.783935-4-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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