bq27541: Correct scaling of voltage_now

This is supposed to return the voltage in uV, not mV.

Change-Id: I13f084f8c5f41f89a7e6c7cfd86e8806229a159b
Signed-off-by: Andrew Dodd <atd7@cornell.edu>

Conflicts:
	drivers/power/bq27541_battery.c