Add hardware monitoring driver for the Maxim MAX127 chip.

MAX127 min/max range handling code is inspired by the max197 driver.
Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Link: https://lore.kernel.org/r/20201123185658.7632-2-rentao.bupt@gmail.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>