aries: config: use tiny rcu

This option selects the RCU implementation that is
designed for UP systems from which real-time response
is not required. This option greatly reduces the
memory footprint of RCU.

Change-Id: Ifed0677b1660f3dc68a934dfa61ed17c6a0cc996
Signed-off-by: Humberto Borba <humberos@gmail.com>