hwmon: (pmbus) Convert command register definitions to enum
hwmon: (pmbus) Convert command register definitions to enum

This will simplify adding new virtual commands.

Tested-by: Michael Jones <a17fed27eaa842282862ff7c1b9c8395a26ac320@proclivis.com>
Signed-off-by: Guenter Roeck <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@roeck-us.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs