arch-x86: Add missing override in the X86 TLB

Change-Id: Ie5ef1aaaef46cf8ef8fa4b0fc8f7efb8cde9b489
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/4283
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

src/arch/x86/tlb.hh

@@ -151,7 +151,7 @@ namespace X86ISA
         /*
          * Function to register Stats
          */
-        void regStats();
+        void regStats() override;
 
         // Checkpointing
         void serialize(CheckpointOut &cp) const override;