dt-bindings: batterydata: Add soft JEITA FCC and FV params

Add DT configuration parameters for specifying the Fast Charging Current
(FCC) and Float Voltage (FV) that are to be applied for soft JEITA
conditions, and the corresponding soft JEITA hysteresis threshold
values.

Change-Id: Ida51390605104a7edf485c84381b90e6f3cf6281
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>