python: Apply Black formatter to Python files

The command executed was `black src configs tests util`.

Change-Id: I8dfaa6ab04658fea37618127d6ac19270028d771
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47024
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/python/m5/objects/SimObject.py

@@ -24,6 +24,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 from m5.SimObject import *
+
 # The ByteOrder enum is defined in params. Expose it here so we can declare it
 # to SCons, since there's no normal SimObject file to make it a part of.
 from m5.params import ByteOrder

src/python/m5/objects/__init__.py

@@ -25,5 +25,5 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 for module in __spec__.loader_state:
-    if module.startswith('m5.objects.'):
+    if module.startswith("m5.objects."):
         exec("from %s import *" % module)