removing pcf50633_voltage_set and friends

[Andy Green]

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Somebody in the thread at some point said:

|> Is there not a way to find this via the regulator API stuff?  We can
|> definitely drop it then and point any users to the regulator version
of it.
|
| Yes, but the regulator API does not allow modification of the value
| AFAIK.

That is probably a good thing...

- -Andy
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