hal: SSR support for pcm playback,pcm record usecases

- Added SSR event handling support in HAL

- Added support to drop incoming pcm data for pcm playback
  usecase during SSR

- Added support to send dummy input(mute/zero buffer) for
  record usecase during SSR

Change-Id: I158b62fa443bb523091128fe1308c9a9b1415502
Audio: Enhance logging in AudioPolicyManager

Enable msg logging
-To print playback clip attributes
-Offload supported or denied

Change-Id: Ifafb8c01ecca41aa2e09a134123d56a695494db4
hal: improve logging.

-log to print open/close/standby of out/in streams
-log to print the the device switches

Change-Id: I1b3bf3d6ba19faa4df804f781fc15c0f96a5b80f
hal: Fix teardown during back to back pause/play of WFD session

- When an active WFD session is paused/played continuously from
  the WFDClient app, the session tears down after a few iterations
  if touch tones are enabled.
- The output device is switched back and forth between speaker and
  proxy when the session is paused and played continuously.
  When this happens, sometimes, there is no backend to write the
  low latency output which results in pcm_write getting blocked.
- Fix the issue by not routing the low latency output to speaker
  if the previous device is proxy.

CRs-Fixed: 630234
Change-Id: I6bbe82badd3d5ee857e920430304c3a45c5b44c7
post_proc: improve logging

Make logs more meaningful and remove
ones not necessary.

Change-Id: I9562cf34a5dee406b1c0347a9004db08de9cd5df
post_proc: disable Bassboost and Virtualizer for USB_ACCESSORY

USB_ACCESSORY is not intended to be applied with SA+ bassboost
and virtualizer, so add into invalid devices list.

CRs-Fixed: 659191
Change-Id: If1f3421f9935ce624dc21895d9244d36d195b2bd
post_proc: fix post and pre process KW issues

KW issue fix includes:
- handle memory allocation failure
- array index boundary check

Change-Id: I083952ba58d348a5b650601a83e6f492b0d686bb
Merge pull request #3 from CyanogenMod/cm-11.0

#3