staging: android: ion: Add support for the audio ML heap

Add support for creating the audio ML CMA heap. This heap will
be used to provide machine learning (ML) information to audio
hardware, which can only use physically contiguous memory.

Change-Id: I7b4677c7a178d3fc8592a43cac08799e8124fefe
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>