drivers: sensor: ina230: driver refactoring

Create an explicit ina230 driver which is supposed to
work with 230 and 231 variants. While at it switch
to i2c_dt_spec helpers and change device-tree node
names to use - instead of _ in order to follow
convention.

Signed-off-by: Bartosz Bilas <b.bilas@grinn-global.com>