hwmon: (k10temp) Remove residues of current and voltage

hwmon: (k10temp) Remove residues of current and voltage

Commit id "fc8ef67eb2a3cfbdf7b36d66e0ff3b7e1960691a",
adds reporting current and voltage to k10temp.c

The commit id "66757d8daf68081329d7ad57ded188aadcb0212d",
removed reporting current and voltage from k10temp.c

The curr and in(voltage) entries are not removed from
"k10temp_info" structure. Removing those residue entries.
while at it, update k10temp driver documentation

Signed-off-by: suma hegde <suma.hegde@amd.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210902174155.7365-2-nchatrad@amd.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>