camera: Disable extra HDR frame on QCOM_HARDWARE

Qualcomm camera HALs default to adding an extra zero-exposure frame
to HDR snapshots; this is breaking third-party apps, and we don't
use it in system-bundled apps, so disable it unless explicitly
requested by the client

Change-Id: Iecb868c5c344d972de7f36dc1bd9cc9fdbabaf4e
audio: mute duration at the beginning of recording

-AudioSource mutes for predefined duration (kAutoRampStartUs)
 at the beginning of a recording. Current kAutoRampStartUs
 is not sufficient to mute the shutter sound click on
 B-Family devices. Sometime shutter sound is getting recorded
 with the current kAutoRampStartUs.

-Issue with calculating muteDuration from getOutputLatency is,
 more delay is getting added for Bt(~1 sec) which is really not
 required.

-Fix is to use constant mute delay which is appropriate

Change-Id: Ied20dc44c56cc74c74fb001383d3c533cb54b632
CRs-Fixed: 636491
Merge remote-tracking branch 'upstream/android-4.4' into android-4.4