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/arch/arm/fastmodel/iris/cpu.cc

@@ -66,14 +66,6 @@ BaseCPU::totalInsts() const
     return count;
 }
 
-void
-BaseCPU::init()
-{
-    gem5::BaseCPU::init();
-    for (auto *tc: threadContexts)
-        tc->initMemProxies(tc);
-}
-
 void
 BaseCPU::serializeThread(CheckpointOut &cp, ThreadID tid) const
 {

src/arch/arm/fastmodel/iris/cpu.hh

@@ -100,8 +100,6 @@ class BaseCPU : public gem5::BaseCPU
         evs_base_cpu->setClkPeriod(clockPeriod());
     }
 
-    void init() override;
-
     void serializeThread(CheckpointOut &cp, ThreadID tid) const override;
 };
 

src/arch/arm/fastmodel/iris/thread_context.hh

@@ -212,8 +212,6 @@ class ThreadContext : public gem5::ThreadContext
         return _isa;
     }
 
-    void initMemProxies(gem5::ThreadContext *tc) override {}
-
     void sendFunctional(PacketPtr pkt) override;
 
     Process *