cpu,fastmodel: Eliminate the now unnecessary initMemProxies method.

The proxies this method initializes no longer exist, since they're now
created locally.

Change-Id: I5fd1c99fbc00f5057ea8868e91be02d577b1c176
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45909
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/cpu/thread_state.hh

@@ -72,14 +72,6 @@ struct ThreadState : public Serializable
 
     Tick readLastSuspend() const { return lastSuspend; }
 
-    /**
-     * Initialise the physical and virtual port proxies and tie them to
-     * the data port of the CPU.
-     *
-     * @param tc ThreadContext for the virtual-to-physical translation
-     */
-    void initMemProxies(ThreadContext *tc) {}
-
     Process *getProcessPtr() { return process; }
 
     void setProcessPtr(Process *p) { process = p; }