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/systemc/python/systemc.py

@@ -29,13 +29,16 @@ from _m5.systemc import sc_main
 from _m5.systemc import sc_time
 from _m5.systemc import sc_main_result_code, sc_main_result_str
 
+
 class ScMainResult(object):
     def __init__(self, code, message):
         self.code = code
         self.message = message
 
+
 def sc_main_result():
-    '''Retrieve and return the results of running sc_main'''
+    """Retrieve and return the results of running sc_main"""
     return ScMainResult(sc_main_result_code(), sc_main_result_str())
 
-__all__ = [ 'sc_main', 'sc_time', 'sc_main_result' ]
+
+__all__ = ["sc_main", "sc_time", "sc_main_result"]

src/systemc/python/tlm.py

@@ -27,7 +27,9 @@ import _m5.systemc
 
 from _m5.systemc import tlm_global_quantum
 
+
 def tlm_global_quantum_instance():
     return tlm_global_quantum.instance()
 
-__all__ = [ 'tlm_global_quantum_instance' ]
+
+__all__ = ["tlm_global_quantum_instance"]