Remove need for assembly offset generation in aecm and ns module.

All *neon.S files in aecm and ns modules have been removed. We need no
assembly offset generation now.

Pass byte to byte conformance test for aecm and ns test in audioproc
between new NEON (written in intrinsics) version and C version on both
ARMv7 and ARM64.

BUG=3580
R=andrew@webrtc.org, jridges@masque.com

Change-Id: I05d43d0c04d00bead65ca8c8fda25f0a42394b2b

Review URL: https://webrtc-codereview.appspot.com/32229004

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

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7800 4adac7df-926f-26a2-2b94-8c16560cd09d