ARM: dts: msm: add support of PMI8937/PMI8940 for MSM8953

Add device tree files to support MSM8953 + PMI8937/PMI8940 platform.
The right dtb is dynamically detected based on the pmic-id.

Change-Id: I91e3e381093806f4d9511b0d013d5a4daaae9a30
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>