Add license header to no_op.cc.
Add license header to no_op.cc.

TBR=niklas.enbom@webrtc.org
BUG=chromium98592
TEST=none

Review URL: https://webrtc-codereview.appspot.com/717004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@2539 4adac7df-926f-26a2-2b94-8c16560cd09d

mwgoldsmith/ilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/libilbc,TimothyGu/libilbc,mwgoldsmith/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/libilbc,mwgoldsmith/ilbc,mwgoldsmith/ilbc,mwgoldsmith/ilbc