python: Remove Python 2.7 compatibility code

We don't support Python 2.7 anymore. Remove glue code like the six
dependency and "from __future__" imports from gem5's standard library.

Change-Id: I71834c325f86ff0329b222be87794ead96081f05
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39584
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

src/python/m5/ticks.py

@@ -24,11 +24,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-from __future__ import print_function
 import decimal
-import six
-if six.PY3:
-    long = int
 
 import sys
 from m5.util import warn
@@ -42,7 +38,7 @@ def setGlobalFrequency(ticksPerSecond):
     from m5.util import convert
     import _m5.core
 
-    if isinstance(ticksPerSecond, (int, long)):
+    if isinstance(ticksPerSecond, int):
         tps = ticksPerSecond
     elif isinstance(ticksPerSecond, float):
         tps = ticksPerSecond