The 3-band splitting filter is highly complex on this architecture. Today this is not a problem, because on those platforms we mostly use AECM which forces us to downsample to 16kHz anyway, but this is a way of guarding against it. In the long term we want to optimize the 3-band splitting filter for ARM architectures, but for now we can just disable it.
Review URL: https://codereview.webrtc.org/1766103002
Cr-Commit-Position: refs/heads/master@{#11900}