power: battery: handle charging termination at lower float voltage

In the scenario where the charging is terminated at lower VFLOAT
(Float voltage configured below battery's VFLOAT), charging doesn't
resume and float voltage in configured back to battery's default
float voltage. Fix this by disabling and re-enabling charging CMD bit
to restart charging.

Change-Id: I4d20e4dca94705d2773ec91d6eeb5c0d192f6763
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>