Policy Hal:  Fix video stutters.

  NULL cannot be used as a third arg for property_get.
  This was causing the offload properties to be ignored
  forcing offload during streaming video.
   Thank you Arcee

Change-Id: I34cb6ffb60a11ad0eb346c99ce7ec96f323c54ae
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_hardware_qcom_audio-caf into HEAD