power_supply: Add properties for external charger to work with FG

IGNORE_FALSE_NEGATIVE_ISENSE property is added for controlling FG be
able to sense the charging current from external charger.
ENABLE_JEITA_DETECTION property is added for enabling FG's soft JEITA
IRQs. This adds the possibility of using FG JEITA IRQs to report battery
JEITA conditions when no thermistor connected on external charger.

CRs-Fixed: 991446
Change-Id: Ic01d8d8c79be81bfd40938bdcb30f9951a471f24
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>