Share some code for spa deadman tunables

We need to do the same thing to update all spas on any OS for these
tunables, so let's share the code.

While here let's match the types of the literals initializing the
variables with the type of the variable.

Reviewed-by: Allan Jude <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Olaf Faaland <[email protected]>
Signed-off-by: Ryan Moeller <[email protected]>
Closes #9964 

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