hwmon: ina2xx: add optional regulator support

TI ina2xx sensors according to datasheets have dedicated
vs supplies. Add it for proper work.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Link: https://lore.kernel.org/r/20230407160508.20479-3-clamor95@gmail.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>