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>

configs/example/arm/workloads.py

@@ -42,8 +42,10 @@ from m5.options import *
 from common.ObjectList import ObjectList
 from common.SysPaths import binary, disk
 
+
 class ArmBaremetal(ArmFsWorkload):
     """ Baremetal workload """
+
     dtb_addr = 0
 
     def __init__(self, obj, system, **kwargs):
@@ -51,6 +53,7 @@ class ArmBaremetal(ArmFsWorkload):
 
         self.object_file = obj
 
+
 class ArmTrustedFirmware(ArmFsWorkload):
     """
     Arm Trusted Firmware (TFA) workload.
@@ -69,20 +72,22 @@ class ArmTrustedFirmware(ArmFsWorkload):
     https://github.com/ARM-software/arm-trusted-firmware
 
     """
+
     dtb_addr = 0
 
     def __init__(self, obj, system, **kwargs):
         super(ArmTrustedFirmware, self).__init__(**kwargs)
 
-        self.extras = [ binary('bl1.bin'), binary('fip.bin'), ]
+        self.extras = [binary("bl1.bin"), binary("fip.bin")]
         self.extras_addrs = [
             system.realview.bootmem.range.start,
-            system.realview.flash0.range.start
+            system.realview.flash0.range.start,
         ]
 
         # Arm Trusted Firmware will provide a PSCI implementation
         system._have_psci = True
 
+
 class _WorkloadList(ObjectList):
     def _add_objects(self):
         """Add all sub-classes of the base class in the object hierarchy."""
@@ -90,4 +95,5 @@ class _WorkloadList(ObjectList):
         for name, cls in inspect.getmembers(modname, self._is_obj_class):
             self._sub_classes[name] = cls
 
-workload_list = _WorkloadList(getattr(m5.objects, 'ArmFsWorkload', None))
+
+workload_list = _WorkloadList(getattr(m5.objects, "ArmFsWorkload", None))