ARM: dts: msm: Update sm6150 DT for kernel machine string

Add qcom,msm-name and qcom,pmic-name to enable
concatenation of model, qcom,msm-name, qcom,pmic-name
for machine string information during boot of kernel
on sm6150.

Change-Id: I4f6c6a628ffc5b18a884a0b6679e02cc34c2aa00
Signed-off-by: Prateek Sood <prsood@codeaurora.org>