NFSD: Budget the CB_LAYOUTRECALL recall stateid

NFS4_enc_cb_layout_sz counts the opcode, the three scalar fields,
the file handle, and the offset and length hypers.
encode_cb_layout4args() also emits the layoutrecall4 discriminator
and the recall stateid, so the macro falls five XDR words short.

This macro sizes p_arglen and nothing else. rq_callsize pads that
with two credential slacks, so the shortfall has never reached
the send buffer. No backport is needed.

Link: https://patch.msgid.link/20260802-nfsd-deleg-destroy-badhandle-v1-3-323aa7196055@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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