audio-caf: add msm8660 back to the build list

  * msm8660 was accidentally removed in 3068cf92813ea9ecc0bb11dfe4d1dc13ab37a4fc

Change-Id: I4d01ab7c7381e144ff0486a6d4fbe198afecb57f
Merge remote-tracking branch 'upstream/cm-11.0' into HEAD