dmabuf_heap_test: Use vendor api level in the tests am: b2b4ab7d86 am: 5075b3e7d6

Original change: https://android-review.googlesource.com/c/platform/system/memory/libdmabufheap/+/1876005

Change-Id: Ic26d1dc76315e3ac14e35b71b0e8caeb48b76772
tree: 1b49526c9aa3300b0305f8c9d8564b097538f574
  1. include/
  2. tests/
  3. Android.bp
  4. BufferAllocator.cpp
  5. BufferAllocatorWrapper.cpp