scftorture: Adjust for TASKS_RCU Kconfig option being selected

This commit adjusts the scftorture PREEMPT and NOPREEMPT scenarios to
account for the TASKS_RCU Kconfig option being explicitly selected rather
than computed in isolation.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/testing/selftests/rcutorture/configs/scf/NOPREEMPT

@@ -7,3 +7,5 @@ CONFIG_NO_HZ_IDLE=n
 CONFIG_NO_HZ_FULL=y
 CONFIG_DEBUG_LOCK_ALLOC=n
 CONFIG_PROVE_LOCKING=n
+CONFIG_KPROBES=n
+CONFIG_FTRACE=n

tools/testing/selftests/rcutorture/configs/scf/PREEMPT

@@ -7,3 +7,4 @@ CONFIG_NO_HZ_IDLE=y
 CONFIG_NO_HZ_FULL=n
 CONFIG_DEBUG_LOCK_ALLOC=y
 CONFIG_PROVE_LOCKING=y
+CONFIG_RCU_EXPERT=y