hwmon: (lm75) Add regulator support

Add regulator support for boards where the sensor first need to be
powered up before it can be used.

Signed-off-by: Alban Bedel <alban.bedel@aerq.com>
Link: https://lore.kernel.org/r/20201001145738.17326-4-alban.bedel@aerq.com


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