Merge "EffectDownmix: Remove obsolete define" am: a4c95a851c am: fe2a40564c am: 5aa9f2cf57

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1700168

Change-Id: Ifd96e32214459c8ec480aaa9ca2c9d35aa52eb23