Add the nacl macros to ARM functions. If not, a bunch of code is failing
to validate.

BUG=319
TESTED=libyuvTest.* on ARM32/64 with Android
R=fbarchard@google.com

Change-Id: I7a36434f18e0de8b8f8a9fe01167bfe50cff8962

Review URL: https://webrtc-codereview.appspot.com/47739004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1343 16f28f9a-4ce2-e073-06de-1de4eb20be90