power: smb349-dual: Add SMB349 Dual Charger driver

SMB349 Dual Charger is a single path switch-mode
battery charger based on SMB349 working in conjunction
with an external charger on the same path.
SMB349 HW to HW suspend signal is used to prevent
SMB349 from charging when external charging is used.

Change-Id: Ibc54e4af874d465c87b1f14f23d380a03c214e07
Signed-off-by: Eugene Yasman <eyasman@codeaurora.org>