libdmabufheap: Add legacy_align to Alloc() interface for legacy ion use am: fb27952132 am: a686206459 am: f9d5235dcf am: 17b5857d3e

Original change: https://android-review.googlesource.com/c/platform/system/memory/libdmabufheap/+/1418856

Change-Id: I765b777b90e310e6adc64004d115c4eced938a1f
tree: 660601061292abb22df49db9dfc5faf23c840279
  1. include/
  2. tests/
  3. Android.bp
  4. BufferAllocator.cpp
  5. BufferAllocatorWrapper.cpp