Merge "libeffects: Testbench for Preprocessing effects agc, aec, ns" am: 8debb9f333 am: 98e41fa9c3 am: fa5e39ea56 am: 6afd734787

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1366796

Change-Id: Ied43ea5aa9a4c8d4b619e9be91a564160cb44a8d