tests: Fix path for module imports in ARM system configs again

One configuration was missed in
 "tests: Fix path for module imports in ARM system configs",
which this changeset remedies.

Change-Id: I705e64298a8251dcfefbdca927d61c9bbb8bbea7
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/4940
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
diff --git a/tests/configs/realview-o3.py b/tests/configs/realview-o3.py
index 6d5752f..7212731 100644
--- a/tests/configs/realview-o3.py
+++ b/tests/configs/realview-o3.py
@@ -37,7 +37,7 @@
 
 from m5.objects import *
 from arm_generic import *
-from common.O3_ARM_v7a import O3_ARM_v7a_3
+from common.cores.arm.O3_ARM_v7a import O3_ARM_v7a_3
 
 root = LinuxArmFSSystemUniprocessor(mem_mode='timing',
                                     mem_class=DDR3_1600_8x8,