o3: get rid of unused physmem pointer

src/cpu/o3/cpu.cc

@@ -200,7 +200,6 @@ FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
       globalSeqNum(1),
 #if FULL_SYSTEM
       system(params->system),
-      physmem(system->physmem),
 #endif // FULL_SYSTEM
       drainCount(0),
       deferRegistration(params->defer_registration)

src/cpu/o3/cpu.hh

@@ -669,9 +669,6 @@ class FullO3CPU : public BaseO3CPU
 #if FULL_SYSTEM
     /** Pointer to the system. */
     System *system;
-
-    /** Pointer to physical memory. */
-    PhysicalMemory *physmem;
 #endif
 
     /** Event to call process() on once draining has completed. */

src/cpu/o3/thread_context.hh

@@ -91,9 +91,6 @@ class O3ThreadContext : public ThreadContext
     virtual System *getSystemPtr() { return cpu->system; }
 
 #if FULL_SYSTEM
-    /** Returns a pointer to physical memory. */
-    virtual PhysicalMemory *getPhysMemPtr() { return cpu->physmem; }
-
     /** Returns a pointer to this thread's kernel statistics. */
     virtual TheISA::Kernel::Statistics *getKernelStats()
     { return thread->kernelStats; }