ARM: dts: msm: enable parallel charging

Add the device tree nodes in order to enable parallel charging. This
includes adding a device tree node for the SMB1357 chip that will be
used as the parallel charger, and adding the parallel charging current
thresholds in the primary charger's nodes.

Change-Id: I3f35feda053267d94df9a9f65d4f9cad9ef2ce76
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>