NFSD: Use xdrgen XDR functions for NFSv2 MKDIR procedure

Replace the NFSPROC_MKDIR entry in the nfsd_procedures2 array
with an entry that dispatches the xdrgen-generated
nfs_svc_decode_createargs and nfs_svc_encode_diropres. MKDIR
reuses the createargs and diropres wrapper structures introduced
for the CREATE conversion, which 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 MKDIR
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_mkdir(). 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.

With CREATE and MKDIR both converted, nfssvc_decode_createargs(),
nfssvc_encode_diropres(), and nfssvc_release_diropres() no longer
have any callers, so they are removed, along with the
svcxdr_decode_sattr() and svcxdr_encode_fhandle() helpers they
relied on. The now-unused nfsd_createargs and nfsd_diropres
structures are removed as well.

Acked-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260916162859.2051-24-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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