lockd: Use xdrgen XDR functions for the NLMv4 SHARE procedure

lockd: Use xdrgen XDR functions for the NLMv4 SHARE procedure

Now that the share helpers have been decoupled from the
NLMv3-specific struct nlm_args and file_lock initialization
has been hoisted into the procedure handler, the NLMv4 SHARE
procedure can be converted to use xdrgen-generated XDR
functions.

Replace the NLMPROC4_SHARE entry in the nlm_procedures4 array
with an entry that uses xdrgen-built XDR decoders and encoders.
The procedure handler is updated to use the new wrapper
structures (nlm4_shareargs_wrapper and nlm4_shareres_wrapper)
and access arguments through the argp->xdrgen hierarchy.

The .pc_argzero field is set to zero because xdrgen decoders
fully initialize all fields in argp->xdrgen, making the early
defensive memset unnecessary. The remaining argp fields that
fall outside the xdrgen structures are cleared explicitly as
needed.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>