torture: Run at least one test with CONFIG_DEBUG_OBJECTS_RCU_HEAD

This commit enables the CONFIG_DEBUG_OBJECTS_RCU_HEAD Kconfig option
in TREE02 in order to do at least some testing with this enabled.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

tools/testing/selftests/rcutorture/configs/rcu/TREE02

@@ -23,3 +23,4 @@ CONFIG_RCU_EXPERT=y
 CONFIG_RCU_TORTURE_TEST_SLOW_CLEANUP=y
 CONFIG_RCU_TORTURE_TEST_SLOW_INIT=y
 CONFIG_RCU_TORTURE_TEST_SLOW_PREINIT=y
+CONFIG_DEBUG_OBJECTS_RCU_HEAD=y