block/rnbd-clt: Replace {NO_WAIT,WAIT} with RTRS_PERMIT_{WAIT,NOWAIT}

They are defined with the same value and similar meaning, let's remove
one of them, then we can remove {WAIT,NOWAIT}.

Also change the type of 'wait' from 'int' to 'enum wait_type' to make
it clear.

Cc: Leon Romanovsky <[email protected]>
Cc: [email protected]
Signed-off-by: Guoqing Jiang <[email protected]>
Reviewed-by: Md Haris Iqbal <[email protected]>
Signed-off-by: Gioh Kim <[email protected]>
Signed-off-by: Jack Wang <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Acked-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Leon Romanovsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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