ARM: dts: qcom: Add devicetree nodes for smb1396/smb1398 devices

SMB1396 can work as a companion charger in either master or
slave role, and SMB1398 can work as a pre-regulator to regulate
the wireless power from the receiver and provide constant power
for downstream chargers, Add device nodes for them.

Change-Id: I40dbaf94e430d28dfa3873c003864f962116c519
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>
Signed-off-by: Ashish Chavan <ashichav@codeaurora.org>