mem,ext: Fixed DRAMSim2 Integration

Fixed the way callbacks were used due to changes in
src/sim/callback.hh. Removed author line in SConsript.

Change-Id: I2c2b8dbe13e4f58680806126cd9cf209748e788a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33938
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

ext/dramsim2/SConscript

@@ -35,7 +35,6 @@
 # (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: Andreas Hansson
 
 import os
 

src/mem/dramsim2.cc

@@ -68,7 +68,7 @@ DRAMSim2::DRAMSim2(const Params* p) :
 
     // Register a callback to compensate for the destructor not
     // being called. The callback prints the DRAMSim2 stats.
-    registerExitCallback([&wrapper]() { wrapper->printStats(); });
+    registerExitCallback([this]() { wrapper.printStats(); });
 }
 
 void