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>.

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@7671 4adac7df-926f-26a2-2b94-8c16560cd09d

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