misc: Run pre-commit run on all files in repo

The following command was run:

```
pre-commit run --all-files
```

This ensures all the files in the repository are formatted to pass our
checks.

Change-Id: Ia2fe3529a50ad925d1076a612d60a4280adc40de
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/62572
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>

site_scons/site_init.py

@@ -44,10 +44,12 @@ from __future__ import print_function
 try:
     EnsureSConsVersion(3, 0, 0)
 except SystemExit as e:
-    print("""
+    print(
+        """
 For more details, see:
     http://gem5.org/documentation/general_docs/building
-""")
+"""
+    )
     raise
 
 
@@ -55,7 +57,8 @@ For more details, see:
 try:
     EnsurePythonVersion(3, 6)
 except SystemExit as e:
-    print("""\033[93m
+    print(
+        """\033[93m
 Python 3 is now required.
 
 The following are steps to compile gem5 in Python 3 environment,
@@ -81,7 +84,8 @@ Python 3 environment,
 
 (Optional) For convenience reasons, you can set up an alias for the Python3 \
 scons phrase in your environment. \033[0m
-""")
+"""
+    )
     raise
 
 from gem5_python_paths import extra_python_paths