configs: Removed redudant exec-style import

garnet_synth_traffic.py imports common.Options on line 40, so exec'ing
the Options.py file again seems redundant.

It also runs Options.py as a script rather than a module, which throws
ValueError: Attempted relative import in non-package due to the recent
change to python3 imports.

Change-Id: Id729a8dfa776af0d14312e765168aff6900eb727
Signed-off-by: Ryan Gambord <gambordr@oregonstate.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17888
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

configs/example/garnet_synth_traffic.py

@@ -88,9 +88,6 @@ parser.add_option("--inj-vnet", type="int", default=-1,
 #
 Ruby.define_options(parser)
 
-exec(compile(open(os.path.join(config_root, "common", "Options.py")).read(),
-             os.path.join(config_root, "common", "Options.py"), 'exec'))
-
 (options, args) = parser.parse_args()
 
 if args: