tfa-next: update rme config to use RNG

 * Set has_rng=1 to fix the following crash on FVP when running RME:

   [FEEDBACK]   WARNING: Core that implements Realm Management
   Extension needs to have Armv8.5-RNG or RNG_TRAP implemented.

Change-Id: I5242eba11c2f68e4b50f1399260ad371324fc6d9
Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>
1 file changed