NFSD: Budget the CB_RECALL truncate field

NFS4_enc_cb_recall_sz counts the CB_RECALL opcode, the stateid, and the
file handle. encode_cb_recall4args() also emits the truncate field, so
the macro falls one XDR word short.

NFSD_CB_MAX_REQ_SZ derives from this macro, so the minimum
ca_maxrequestsize a client must advertise rises by four bytes.

The field has been unbudgeted since the macro was written. Neither
consumer of the macro justifies a backport. rq_callsize covers
p_arglen with two credential slacks. The only client affected is one
whose ca_maxrequestsize falls inside those four bytes.

Link: https://patch.msgid.link/20260802-nfsd-deleg-destroy-badhandle-v1-2-323aa7196055@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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