libdmabufheap: Add libdmabufheap to vndk-sp am: 04afbcdc42 am: 6d76328a68

Original change: https://android-review.googlesource.com/c/platform/system/memory/libdmabufheap/+/1488083

Change-Id: I770723a3a6c74fc4be87d87b91d816e6e5ba568d
tree: 985e79e6fb371113d63426127d6ad27ad890e792
  1. include/
  2. tests/
  3. Android.bp
  4. BufferAllocator.cpp
  5. BufferAllocatorWrapper.cpp