ARM: dts: msm: add device tree support for msm8937

Add device tree support for msm8937-pmi8950 MTP device.
This implementation is based on snapshot of the
msm8937 device tree from msm-3.18 commit 777fba3d04460
("Update target name references for MSM8937").

Change-Id: Ic1f85c301b272b564287db85ab83914388a633e6
Signed-off-by: Jingbiao Lu <jingbiao@codeaurora.org>