rcu: Update rcu torture maintainership filename patterns

Commit 51b1130e ("rcutorture: Abstract rcu_torture_random()")
moved the file, so this commit updates the patterns.

Signed-off-by: Joe Perches <joe@perches.com>
cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>