hal: Add support for multiple instances of offload playback

Add support for multiple offload playback instances

Change-Id: I9d35b68fc8ca27c4eeb3976eb508b06c5ad3ca8f
hal: configure HDMI channels based on sink capability.

- configure output HDMI channel count based on sink
  capability when audio.use.hdmi.sink.cap is set to true

CRs-Fixed: 656308
Change-Id: I3dd3226054c68a69a2c29f8bb2f9c27e429ad2dc
hal: SSR support for compress offload

- add support for time stamp error propagation
  to frameworks on compress driver error

- close active compress session on SSR

Change-Id: I9cbd3a6c271097b81c9b79e71573fda8d78c7dbf
hal: SSR support for compress offload

- reject offload request based on sound
  card state

Change-Id: I38256ce6163f948a9e9c14cb895de3f71529a0e9
hal: Support for FLAC 24 bit format in offload path

- Add flac in supported codecs list
- Set FLAC codec specific parameters
- Set fragment size based on bit width and sampling rate
  for flac.
- Configure backend to 24/16 bit based on the current
  usecases running

Change-Id: If013078e277fd3053fba6489345803f8f58bd86d
Audio: Fix for sound card status overwrite issue

 - Sound card status is getting over written to OFFLINE
   by HAL internally on continuous SSR
 - Fix by returning different error code for snd card offline
   update in HAL internally instead of ENETRESET

Change-Id: I98a34d8b667dff045a1e99d18307376579ac4ebc
hal: add support for pcm_ioctl() api

- Tinyalsa doesn't expose an api to call
  ioctls exposed by the audio drivers.
- Add pcm_ioctl() api to support pcm ioctl.

Change-Id: I448252e8d3347257a73c56bc8ed341abc2dd2dab
policy: Add support for multiple instances of offload playback

Add support for multiple offload playback instances

Change-Id: Icab3c7d6e89121a7aa23744729a634d8e402fabf
hal: Add multiple offload support for msm8974

 * msm8974 can also benefit from multiple tunnel support, but
   is limited to four devices. This allows for reliable gapless
   playback and other use cases.

Change-Id: Ie0698cc0d600a23df0799482a79181f248a001e7
hal: Featureize FLAC offload support

 * Not all devices will have this code in the DSP, let alone the kernel.
 * Featurize it, but leave the codec bit width and sample rate controls
   in place so that 24-bit PCM offload still works.

Change-Id: I6e156048906a2b638e9ec4a083755536a14e161f
hal: Offload bugfixes

 * Always reset the bit width and sample rate if any active offload
   stream is different. Failure to do this can crash the DSP, and
   certain limitations come into play when a high samplerate is used
   such as effects being unavailable.
 * Don't send errors to the framework when the timestamp query fails
   before the stream is up and running.

Change-Id: Ieeaafe8965e3cdc69b8dd64be85fbb3bf48c020b
hal: Extend MULTIPLE_OFFLOAD_ENABLED ifdef

* Fixes compilation for non-MSM8974 devices without
  MULTIPLE_OFFLOAD_ENABLED

Change-Id: I8a83d10e68618e141a128af5198ebf1bfb731a6a
hal: PCM offload shouldn't enable all types of offloading

 * Some older versions of the DSP cannot offload audio streams
   for A/V content. Remove the extra check so each feature must
   be explicitly enabled on the device.

Change-Id: I23aac6be5bd160b61e54eab8761e97bbbd5ae045
hal: Fix the samplerate/bitwidth comparison

Change-Id: If507ee28d4b3333dd91af286f2653554590fd7c4
hal: Avoid unnecessary rerouting for sample rate changes

 * The backend codec supports just a few sample rates directly,
   so make sure that we base our decision to reroute on this
   value instead of the actual sample rate of the stream.

Change-Id: I2ed82354563f60d04febb0e200252d0f45644a5e
Limit codec offload to devices with QCOM_AV_ENHANCEMENTS enabled

Don't even try to build this, nothing will invoke it and it may require
non-existing definitions for compression on the device

Change-Id: I1bf8055259e1dc937048269132a7e717d5fc6a01
hal: Limit MP2 and WMA offload to 8226/8974 devies only

* 8960 devices are not capable of these features.

Change-Id: I37ee867c4e8377d70344abec5d72a5de86c45ca5
Merge pull request #7 from CyanogenMod/cm-11.0

#7