power: supply: max17040: Support compatible devices
The max17040 fuel gauge is part of a family of 8 chips that have very
similar mode of operations and registers.
This change adds:
- compatible strings for all supported devices and handling for the
minor differences between them;
- handling for devices reporting double capacity via maxim,double-soc;
The datasheets of the supported devices are linked [0] [1] [2] [3].