One-off hack for 40Gb ports on S5048 switch.
The ports are 100Gb but must be "broken out" to a single 40Gb port. FortyGig ports show up as <module>/<port>/1, which is different than what the "nybbleEncoded" feature expects. XXX this seriously needs to be revisited to see if there is a generalization to be made; right now I just don't want to break other users of this module (i.e., Clemson) by doing something rash.
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