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/dev/IntPin.py

@@ -25,8 +25,8 @@
 
 from m5.params import Port, VectorPort
 
-INT_SOURCE_ROLE = 'Int Source Pin'
-INT_SINK_ROLE = 'Int Sink Pin'
+INT_SOURCE_ROLE = "Int Source Pin"
+INT_SINK_ROLE = "Int Sink Pin"
 Port.compat(INT_SOURCE_ROLE, INT_SINK_ROLE)
 
 # A source pin generally represents a single pin which might connect to
@@ -35,6 +35,7 @@ class IntSourcePin(VectorPort):
     def __init__(self, desc):
         super().__init__(INT_SOURCE_ROLE, desc, is_source=True)
 
+
 # A vector of source pins which might represent a bank of physical pins. Unlike
 # IntSourcePin, each source pin in VectorIntSourcePin can only connect to a
 # single sink pin. VectorIntSourcePin has the same definition as IntSourcePin
@@ -46,12 +47,14 @@ class VectorIntSourcePin(VectorPort):
     def __init__(self, desc):
         super().__init__(INT_SOURCE_ROLE, desc, is_source=True)
 
+
 # Each "physical" pin can be driven by a single source pin since there are no
 # provisions for resolving competing signals running to the same pin.
 class IntSinkPin(Port):
     def __init__(self, desc):
         super().__init__(INT_SINK_ROLE, desc)
 
+
 # A vector of sink pins represents a bank of physical pins. For instance, an
 # interrupt controller with many numbered input interrupts could represent them
 # as a VectorIntSinkPin.