clear asm code and unused functions in audio processing module
clear asm code and unused functions in audio processing module

BUG=
R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/25119004

Patch from Zhongwei Yao <zhongwei.yao@arm.com>.

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: d024f759a86a9a50ade7e864b1b673d75f5bf160

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