NFSD: Use xdrgen XDR functions for the NFSv2 LOOKUP procedure

Replace the NFSPROC_LOOKUP entry in the nfsd_procedures2 array
with an entry that dispatches the xdrgen-generated
nfs_svc_decode_diropargs and nfs_svc_encode_diropres. Wrapper
structures bridge the generated xdrgen types and the legacy
svc_fh and kstat representations the NFSD VFS layer still uses.

The pc_argzero field is now set to zero for the NFSv2 LOOKUP
procedure. The xdrgen decoders are trusted to initialize all
arguments in the argp->xdrgen field, making the early defensive
memset unnecessary. The remaining argp fields are cleared as
needed.

This refactor replaces the use of svcxdr_encode_fattr(), so the
references to the directory and object file handles can be
released directly by nfsd_proc_lookup(). A separate ->pc_release
callback is thus no longer needed. This makes it straightforward
to confirm that the file handles are properly released during
every error flow.

Acked-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260916162859.2051-13-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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