power: supply: bq25890: Fix initial setting of the F_CONV_RATE field

The code doing the initial setting of the F_CONV_RATE field based
on the bq->state.online flag. In order for this to work properly,
this must be done after the initial bq25890_get_chip_state() call.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>