power: battery: handle charging termination at lower float voltage

In scenarios when charging terminates at lower vfloat(charger
configured to float voltage lower than battery profiles default vfloat),
charging doesn't resume when charger is configured back to higher vfloat.
Fix this by disabling and re-enabling charging CMD bit to restart charging.

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