power: qpnp-smbcharger: enable charging based on command register

The charger driver is incorrectly configuring the charger to enable
based on pin control instead of the command register. Fix this by
removing the incorrect configuration.

Change-Id: I403b6b35bc3c9d647ab7b660c176e640eea94bb2
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>