power: supply: core: Use fwnode_property_*() in power_supply_get_battery_info()

Switch power_supply_get_battery_info() over to use the generic
fwnode_property_*() property read functions. This is a preparation patch
for adding support for reading properties from other fwnode types such
as swnode properties added by platform code on x86 devices.

Note the parsing of the 2d matrix "ocv-capacity-table-%d" and
"resistance-temp-table" properties is not converted since this depends on
the raw of_get_property() accessor function of which there is no
fwnode_property_*() equivalent AFAICT. This means that these properties
will not be supported in swnodes for now.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>