Below pull request for ARM32 DeviceTree updates for v6.7 was posted to
late to make it into v6.7, merge it into the branch for v6.8.

More Qualcomm Arm32 DeviceTree updates for v6.7

This introduces new DeviceTree source for Microsoft Lumia 640, Microsoft
Lumia 640 XL, Nokia Lumia 735, and Nokia Lumia 830, built on MSM8226 and
MSM8926.

A few stylistic issues are corrected on MSM8974.