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This doesn't actually create a HAL, but rather a set of helper static
libraries that device specific libraries (i.e. the old libaudio pieces)
can link against to create a proper audio HAL module.

We provide an audio_policy static wrapper and audio hardware interface
static wrapper.

Change-Id: Ie56195447ad24b83888f752dca24674b0afd8a76
Signed-off-by: Dima Zavin <dima@android.com>