power: qti_battery_charger: call power_supply_changed() if fake_soc is set

There are clients who are waiting for power supply change events
when fake soc is set during testing. Call power_supply_changed()
to support them.

Change-Id: I6a1f4e7daa136b3783f5ed35f37abafad7447378
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>