power: smb1360: Changes to support SMB v2.1

1. Update delta-SOC register address to 0x28 and voltage-min to 0x2B
2. Report the battery resistance via power_supply class
3. Dump the FG config registers

CRs-Fixed: 680334
Change-Id: Idea16686dbe678f6de33796083a2bcb09b94c236
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>