power: bq27x00_battery: Remove unneeded i2c MODULE_ALIAS

The MODULE_DEVICE_TABLE macro automatically adds all needed
i2c MODULE_ALIASes so remove the extra MODULE_ALIAS.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>