tests: Disable descriptions in stat files

Don't output verbose text descriptions in stat files when running
tests. This saves a lot of space when storing reference data.

Change-Id: I2a7ead4843586e800ecf83846694b73f0c356373
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Tony Gutierrez <anthony.gutierrez@amd.com>

tests/testing/units.py

@@ -146,6 +146,7 @@ class RunGem5(TestUnit):
         gem5_cmd = [
             self.gem5,
             "-d", self.test_dir,
+            "--stats-file", "text://stats.txt?desc=False",
             "-re",
         ] + self.args