power: qpnp-qnovo5: Revoke vote to disable CP upon USB disconnect

Once userspace enables "standalone" mode, the charge pump will remain
disabled until userspace disables it via a zero-write to that parameter.
Fix this so that the charge pump may get re-enabled upon USB reinsertion
following a disconnection.

Change-Id: I9e700a2e9811190d701d950ef293b603ca66396e
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>