tests: drivers: build_all: fuel_gauge: Add devices to build test

Add build tests for the following missing devices:
- x-powers,axp2101-fuel-gauge
- onnn,lc709203f
- silergy,sy24561

This is important, because it guarantees that all drivers will be
build the driver during CI.

Signed-off-by: Philipp Steiner <philipp.steiner1987@gmail.com>