drivers: fuelgauge: Add Hycon Technology HY4245 driver

Add a support for Hycon Technology HY4245 fuel gauge driver.

The HY4245 operates with Single and Two Cells Li+ battery cells as a
stand–along battery gauge. The device uses GaugePackTM algorithm, which
mixes Coulomb–Counting and Open–Circuit–Voltage (OCV) measurements with
battery cell characteristics to manage battery gauge, to maintain accurate
battery capacity estimates with compensation for rate, temperature, age
and self–discharge effects.

Signed-off-by: Saravanan Sekar <saravanan@linumiz.com>
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