Modifications to audio_hal for Android@Home.

This is a squashed merge of the following changes:

Commit f560da61a5e128ca9f82f7fe939afcf1f09188c7
Author: John Grossman <johngro@google.com>
Date:   Thu Aug 11 15:34:55 2011 -0700

    Fill out a missing entry in the audio HAL function table.

    The entry for get_initial_master_volume was missing from the non-legacy audio
    HAL and needs to be filled out.  Also fix up the order of the comments
    describing the get_initial_master_volume method.

    Change-Id: I87d5415ef92611497a6dab4c657fc00367c4d80b

commit cea82facb63fd237a4ea6fb770605fcb500850ff
Author: Jason Simmons <jsimmons@google.com>
Date:   Thu Jun 16 14:24:24 2011 -0700

    Define a replacement for getSampleDelta that returns a DMA start time and count of samples queued

    Change-Id: I2d13f57b5a8c5b97fb3aa0a90834ce91c56864ef

commit 60a9acd7eee470a8d870218e8be618bfa3be15a5
Author: Mike J. Chen <mjchen@google.com>
Date:   Tue Jun 7 09:13:23 2011 -0700

    Add Android@Home extensions to new Audio HAL interface.

    Change-Id: I3ea4676d4b7d2afd78a5a7a7003ad5c437276d05
    Signed-off-by: Mike J. Chen <mjchen@google.com>

Change-Id: I09f3756d12a1ce4f9af39610ed857890742a72df
Signed-off-by: Mike J. Chen <mjchen@google.com>
Signed-off-by: John Grossman <johngro@google.com>

Conflicts:

	include/hardware/audio.h
	modules/audio/audio_hw.c
3 files changed