Merge "libeffects: AEC mobile mode set as default" am: 1b676d1d25 am: a853911f9f am: 1483ff7f6a

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1511089

Change-Id: Ia6e2990fae48e8aff22e56c2f8badfddb01a8217