misc: Re-remove Authors lines from source files.

These were universally removed a while ago, but a bunch have crept back
in. Remove them.

Change-Id: I3cb5b9f40c9c19aafb5e39a51d1baeae60a591c0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40335
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Gabe Black <gabe.black@gmail.com>

src/gpu-compute/kernel_code.hh

@@ -29,8 +29,6 @@
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
- *
- * Authors: Anthony Gutierrez
  */
 
 #ifndef __GPU_COMPUTE_KERNEL_CODE_HH__