power: smb135x-charger: Update use of ONLINE property

ONLINE property is supposed to indicate whether the device is
drawing power from the charger source. When charging
is disabled the USB and DC path are suspended which makes the
charger stop drawing any current from USB or DC.

Update the driver to set ONLINE to false when charging
is disabled.

Change-Id: I560782ce113f9198a14f4ce3e6d9292609351853
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>