arch-arm: Turn on EL2/EL3 support by default in ArmSystem

In order to turn them off a user needs to explicitly do so
by providing a different ArmRelease objec

Change-Id: I227cee80c5517cdd50cf07c62d9a131ce261310f
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/51011
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/example/arm/baremetal.py

@@ -141,8 +141,6 @@ def create(args):
     system.realview.gic.gicv4 = False
 
     system.highest_el_is_64 = True
-    system.release.add(ArmExtension('SECURITY'))
-    system.release.add(ArmExtension('VIRTUALIZATION'))
 
     workload_class = workloads.workload_list.get(args.workload)
     system.workload = workload_class(

src/arch/arm/ArmSystem.py

@@ -103,7 +103,7 @@ class ArmRelease(SimObject):
 
 class Armv8(ArmRelease):
     extensions = [
-        'LPAE'
+        'LPAE', 'VIRTUALIZATION', 'SECURITY'
     ]
 
 class ArmDefaultRelease(Armv8):