audio policy: fix gapless playback when effects enabled

Do not allow offloading if one non offloadable effect is enabled. This prevents from
creating an offloaded track and tearing it down immediately after start when audioflinger
detects there is an active non offloadable effect.
Not doing so breaks gapless playback because AwesomePlayer will always be able to open
an offloaded track which will not be compatible with the previous PCM track and
Audiosink::open() will not recycle it.

Bug: 11181933.
Change-Id: I6d163806849d9093b9ec701ba8e8c1ccb658e3c8
merge in klp-release (no-op)
Merge "audio policy: fix gapless playback when effects enabled" into klp-dev
Define and use DRC-specific volume curves when applicable

Add support for property defining whether a DRC on the speaker path
 is enabled and will boost soft sounds.
Define new volume curves with more attenuations than existing ones
 to compensate for DRC-induced boost on sonification sounds to
 provide a more "linear" control to the user over the applied volume.

Bug 11600699

Change-Id: If23dd097a8b9b5ebb61e75dd8512ff75e63ba899
Merge tag 'android-4.4.1_r1' into HEAD

Android 4.4.1 Release 1

Conflicts:
	audio/AudioPolicyManagerBase.cpp

Change-Id: I4671ff8c7de55cbe0edd14c5bf6a71671e61907c
AudioPolicyManagerBase : MUTE_TIME_MS reduced to 500ms

 - Some streams are muted while the audio path
   is switched for different device switch like
   BT, Headset, AOS and HDMI etc. Audio drop is
   observed for more than 3-4 secs. So tuning
   this macro for better results.

Change-Id: I8bb0b6f5eb5e526b755fce97f31a3f8f6dd22064
CRs-fixed: 572654
audio :Make isVirtualInputDevice as protected method

- startInput is overridden in AudioPolicyManagerALSA and is
  making a call to isVirtualInputDevice which is private in
  AudioPolicyManagerBase.
- Make isVirtualInputDevice as protected in base class so
  that it can be called from the derived class

Change-Id: I7e499b0c06f9412bc191179d497298cd57af2c3a
CRs-Fixed: 591788
Merge pull request #1 from Evervolv/kitkat

Merge