NFSD: Use xdrgen XDR functions for NFSv2 CREATE procedure

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

The pc_argzero field is now set to zero for the NFSv2 CREATE
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 parent directory and the new object file
handles can be released directly by nfsd_proc_create(). 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.

nfssvc_decode_createargs remains for the MKDIR procedure which
uses the same argument structure.

Acked-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260916162859.2051-19-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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