mem: missing override specifier

Change-Id: Ied4817bcda317826303a1bb688b41823b18b489b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18128
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>

src/mem/simple_mem.hh

@@ -97,7 +97,7 @@ class SimpleMemory : public AbstractMemory
         void recvFunctional(PacketPtr pkt) override;
         bool recvTimingReq(PacketPtr pkt) override;
         void recvRespRetry() override;
-        AddrRangeList getAddrRanges() const;
+        AddrRangeList getAddrRanges() const override;
     };
 
     MemoryPort port;