power: qpnp-smbcharger: Fix compilation and other issues

pmic-voter.h file is moved from local directory to other
location. Fix the include file path for the same. Also fix
other coding style issues.

Change-Id: I5fde0c06a6d70e4bec7e765165c8c97e8dad290b
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>