ANDROID: fixup dma_buf struct to avoid ABI breakage

Wrap dma_buf into dma_buf_ext object containing additional nr_task_refs
field required for dmabuf PSS accounting.

Bug: 424648392
Bug: 435768786
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
(cherry picked from https://android-review.googlesource.com/q/commit:96d9ec434e20ae6e3c9bbc63b5f881ff887e227f)
Merged-In: I192aa6c5d27b7100715be3bc192021a65c07e005
Change-Id: I192aa6c5d27b7100715be3bc192021a65c07e005