device: use NMUnmanFlagOp enum members instead of literals
Replace TRUE or FALSE for their NMUnmanFlagOp enum member. It is more intuitive for newcomers so they can understand what is being set without looking at the values or function logic.
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Replace TRUE or FALSE for their NMUnmanFlagOp enum member. It is more intuitive for newcomers so they can understand what is being set without looking at the values or function logic.