qpnp-smb2: support setting FCC and float voltage in battery power supply

Fast charge current (FCC) and float voltage are parameters that
are battery specific and needs to be set based on the profile
detected by Fuel Gauge driver. Expose the following properties
from battery power supply so that FG can set them.

- POWER_SUPPLY_PROP_VOLTAGE_MAX
- POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX

Change-Id: I72465484b154b1a758285d58906ce7661a246767
Signed-off-by: Harry Yang <harryy@codeaurora.org>
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>