util,mesa,panfrost: Drop some author tags

This is what git blame is for

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22120>

src/mesa/main/copyimage.c

@@ -20,9 +20,6 @@
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
- *
- * Authors:
- *    Jason Ekstrand <jason.ekstrand@intel.com>
  */
 
 #include "context.h"

src/panfrost/util/nir_mod_helpers.c

@@ -20,11 +20,6 @@
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
- *
- * Authors:
- *    Alyssa Rosenzweig <alyssa@collabora.com>
- *    Jason Ekstrand (jason@jlekstrand.net)
- *
  */
 
 #include "nir.h"

src/util/u_worklist.c

@@ -20,10 +20,6 @@
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
- *
- * Authors:
- *    Jason Ekstrand (jason@jlekstrand.net)
- *
  */
 
 #include "u_worklist.h"

src/util/u_worklist.h

@@ -20,10 +20,6 @@
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
- *
- * Authors:
- *    Jason Ekstrand (jason@jlekstrand.net)
- *
  */