power: smb1351-charger: update drive to support parallel architecture

Re-organize SMB1351 charger driver to support new parallel charger
architecture.
- New property "POWER_SUPPLY_PROP_PARALLEL_MODE" exposes the parallel
  charger configuration, in this case it is USBIN-USBIN configuration.
- Property "POWER_SUPPLY_CHARGE_TYPE" is added to report the current
  charge type and is also used for parallel charger chip detection.

Change-Id: I05692b34daef244f89a365e03043ae2ffe42d9da
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>