ARM: dts: msm: add qpnp-smbcharger nodes for pmi8994

Add in the device tree nodes for the qpnp-smbcharger on the pmi8994
device tree include in order to enable support for battery charging and
USB detection.

Change-Id: I81770693d6ea7c57f7b98aea5950df868e342e94
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>