power: qpnp-smbcharger: add voting logic for enabling/disabling HVDCP

HVDCP can be enabled from multiple location in the charger driver. Update
HVDCP enable/disable logic to use voting mechanism.

CRs-Fixed: 1050520
Change-Id: Ifa42d0d13a10ce803d5ce19e59659d56d0c92f43
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>