Cleanup vmt(4) by changing an ugly if statement for received commands into a table of callbacks.  Additionally, turn printfs into DPRINTFs to make the driver less chatty by default.
Cleanup vmt(4) by changing an ugly if statement for received commands
into a table of callbacks.  Additionally, turn printfs into DPRINTFs
to make the driver less chatty by default.

OK deraadt@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars