ARM: dts: msm: Add entry for non secure display heap memory

1. Add entry to reserve 100 MB contiguous memory from non secure
   display heap to allocate demura buffers and image buffer for
   TUI use case
2. Allocated buffers from this heap will be exported to secondary
   VM to use it for composition during TUI session

Change-Id: I02df4631610099fbb7c01a716b4c2144db5c8722