[mlir][openacc][NFC] Remove useless OptionalAttr with UnitAttr (#68337)
`UnitAttr` exits or not so adding `OptionalAttr` around it is not necessary. This patch cleanup this for the `RoutineOp`
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`UnitAttr` exits or not so adding `OptionalAttr` around it is not necessary. This patch cleanup this for the `RoutineOp`