arch-arm: Add an Armv8.3 ArmRelease object

Change-Id: I7bd5fee4a5958f6669e1d0ac29e0c62f8f019204
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/51020
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

src/arch/arm/ArmSystem.py

@@ -129,6 +129,11 @@ class Armv82(Armv81):
         'FEAT_UAO', 'FEAT_LVA', 'FEAT_LPA', 'FEAT_SVE'
     ]
 
+class Armv83(Armv82):
+    extensions = Armv82.extensions + [
+        'FEAT_FCMA', 'FEAT_JSCVT', 'FEAT_PAuth',
+    ]
+
 class ArmSystem(System):
     type = 'ArmSystem'
     cxx_header = "arch/arm/system.hh"