misc: Use python f-strings for string formatting

This patch has been generated by applying flynt to the
gem5 repo (ext has been excluded)

JIRA: https://gem5.atlassian.net/browse/GEM5-831

Change-Id: I0935db6223d5426b99515959bde78e374cbadb04
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/68957
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>

util/style/sort_includes.py

@@ -136,7 +136,7 @@ def _include_matcher_main():
         base, ext = m.groups()
         (keyword, fname, extra) = base_matcher(context, line)
         try:
-            if fname == "%s.%s" % (base, header_map[ext]):
+            if fname == f"{base}.{header_map[ext]}":
                 return (keyword, fname, extra)
         except KeyError:
             pass
@@ -342,6 +342,6 @@ if __name__ == "__main__":
             dir_ignore=args.dir_ignore,
         ):
             if args.dry_run:
-                print("{}: {}".format(filename, language))
+                print(f"{filename}: {language}")
             else:
                 update_file(filename, filename, language, SortIncludes())