lockd: Introduce new-style XDR functions for NLMv4

We'd like to prevent local buffer overflows caused by malicious or
broken servers.  New xdr_stream style decoders can do that.

For efficiency, we also want to be able to pass xdr_streams from
call_encode() to all XDR encoding functions, rather than building
an xdr_stream in every XDR encoding function in the kernel.

Same idea as the NLM v3 XDR overhaul.

Signed-off-by: Chuck Lever <[email protected]>
Tested-by: J. Bruce Fields <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>

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