power: qpnp-smbcharger: Fix ICL voting on USB removal

The voting logic fails to update ICL if USB is removed,
this fails the ICL update for the applicable client.
Fix this by requesting 0mA when USB is removed instead
of removing the vote.

CRs-Fixed: 1052814
Change-Id: Ib223d63d7cda22f3a79ddb6f0ef30df291339716
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>