Some of our files didn't have a copyright notice at all, let's add it. Also, update the notices in other files and ensure a SPDX identifier is present in all but the most trivial files. Change-Id: If7fa19ce484b415bc645e39b3d0d666b44b5f0fd
Change-Id: I530f8f444d1c7ea0bf11d510da7b97f64a2039f5