configs: Remove Python 2.7 glue code

Remove uses of six and from __future__ imports as they are no longer
needed.

Change-Id: I6e2f270557d7343bbad30c8e6d743e363c43715a
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39755
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/ruby/GPU_VIPER.py

@@ -29,7 +29,6 @@
 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
-import six
 import math
 import m5
 from m5.objects import *
@@ -44,9 +43,6 @@ addToPath('../')
 from topologies.Cluster import Cluster
 from topologies.Crossbar import Crossbar
 
-if six.PY3:
-    long = int
-
 class CntrlBase:
     _seqs = 0
     @classmethod
@@ -261,8 +257,8 @@ class TCC(RubyCache):
           self.dataArrayBanks = 256 / options.num_tccs #number of data banks
           self.tagArrayBanks = 256 / options.num_tccs #number of tag banks
         self.size.value = self.size.value / options.num_tccs
-        if ((self.size.value / long(self.assoc)) < 128):
-            self.size.value = long(128 * self.assoc)
+        if ((self.size.value / int(self.assoc)) < 128):
+            self.size.value = int(128 * self.assoc)
         self.start_index_bit = math.log(options.cacheline_size, 2) + \
                                math.log(options.num_tccs, 2)
         self.replacement_policy = TreePLRURP()