sim: Move the MemPools object out of System and into SEWorkload.

This removes the need for all the FullSystem checks in the System class,
and simplifies that class in general.

Change-Id: Ie8a3bc67db9195027d2111009b15ca59221bdeb2
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50348
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/arch/mips/linux/se_workload.hh

@@ -30,6 +30,7 @@
 #define __ARCH_MIPS_LINUX_SE_WORKLOAD_HH__
 
 #include "arch/mips/linux/linux.hh"
+#include "arch/mips/page_size.hh"
 #include "arch/mips/se_workload.hh"
 #include "params/MipsEmuLinux.hh"
 #include "sim/syscall_desc.hh"
@@ -49,7 +50,7 @@ class EmuLinux : public SEWorkload
   public:
     using Params = MipsEmuLinuxParams;
 
-    EmuLinux(const Params &p) : SEWorkload(p) {}
+    EmuLinux(const Params &p) : SEWorkload(p, PageShift) {}
 
     void syscall(ThreadContext *tc) override;
 };