Reorder functions for consistency when doing RGB functions.  Order should now be ARGB, BGRA, ABGR, RGB24, RAW, RGB565, ARGB1555, ARGB4444
BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/352013

git-svn-id: http://libyuv.googlecode.com/svn/trunk@136 16f28f9a-4ce2-e073-06de-1de4eb20be90