power: smb5: enable parallel charging support

Enable parallel charging support in charger driver:
- Configure STAT CMD in main charger, which enables parallel chip.
- Only disable hvdcp hw INOV for PMI8998/PM660, for all new
  platforms hw INOV is disabled in main charger.

Change-Id: I84037ca93c9801b28e47157923817413f7091e2c
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>