power: qpnp-smbcharger: Use new voting scheme for charging enable/suspend

Update the charger driver to use the new voting scheme implemented
to vote for dc_suspend, usb_suspend and charging_enable.

Change-Id: Ib5ac575ba640d563f4a757b52e12715924562e67
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>