audio: avoid mute delay when no active stream

-Dialpad touch tone delay is observed when connected USB
 headset. This is beacuse of mute delay during  device switch
-In this usecase, mute delay is not required as there is no
 actual device switch
-Fix is to avoid delay in this usecase.

Change-Id: Ib9e7d7f953f740c9f96c43a104edd0b548421e8d
CRs-Fixed: 706678
audio: Avoid mute delay during stopping of tones.

 - Each time tone is played extra delay added due to
   checkDeviceMuteStrategies during stop of tone.
 - Such mute delay is not needed in this scenario when
   there is no actual device switch.
 - Fix is to avoid mute during stop of tone.

Change-Id: I16e11ab846044fc14cb625cee8bf8273e0e4bcc3
audio: msm8660: add presto audio.

Import audio from presto repo, because the local module don't build.

Change-Id: I58418fd4a5aa39302e24a78cb35be76f7902801c
presto: audio: fix error

Change-Id: I6ecf222eeb42efcba45bb2639f0d97b7706fd188
presto: audio: define PRESTO_AUDIO

Change-Id: Ie801771f7409dfb4215c99656482623c6e419c0e
Revert "presto: audio: define PRESTO_AUDIO"

This reverts commit f16f3eca14407c6f4b3987b6d9b3717df8894f17.

Change-Id: Ic091b85c661cb64ddef887131a8cde1e5a076801