hardware-libaudio

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audio_route: fix mediaserver crash

The segfault is because a null audio_route param is passed into
function reset_mixer_state.

Issue: 1209

Fix bad sleep time

The bad sleep time occurs when pcm_get_htimestamp() fails, leaving
kernel_frames uninitialized and causing out->cur_write_threshold to be
set to a very large value. The following patch ensures kernel_frames is
initialized to a sane value, it should fix most of the "limiting sleep
time" warnings and stuttering audio caused by sleeping too much.

add audio.usb.default

Suggested by Masaki Muranaka <monaka@monami-ya.jp>.

detect pcm card automatically

audio hal for jb-x86

Import from device/asus/grouper/audio of AOSP.

initial import