power: supply: add support for MAX1720x standalone fuel gauge

The MAX17201 monitors a single cell pack. The MAX17205 monitors and
balances a 2S or 3S pack or monitors a multiple-series cell pack. Both
devices use a I2C interface.

Signed-off-by: Dimitri Fedrau <dima.fedrau@gmail.com>
Link: https://lore.kernel.org/r/20240702090308.8848-3-dima.fedrau@gmail.com


Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>