IOS/MIOS: Eliminate global system accessors

We can pass the system instance through the EmulationKernel instance.

Source/Core/Core/IOS/IOS.cpp

@@ -329,7 +329,7 @@ EmulationKernel::EmulationKernel(Core::System& system, u64 title_id)
 
   if (title_id == Titles::MIOS)
   {
-    MIOS::Load();
+    MIOS::Load(m_system);
     return;
   }
 

Source/Core/Core/IOS/MIOS.cpp

@@ -30,12 +30,11 @@
 
 namespace IOS::HLE::MIOS
 {
-static void ReinitHardware()
+static void ReinitHardware(Core::System& system)
 {
   SConfig::GetInstance().bWii = false;
 
   // IOS clears mem2 and overwrites it with pseudo-random data (for security).
-  auto& system = Core::System::GetInstance();
   auto& memory = system.GetMemory();
   std::memset(memory.GetEXRAM(), 0, memory.GetExRamSizeReal());
   // MIOS appears to only reset the DI and the PPC.
@@ -56,9 +55,8 @@ static void ReinitHardware()
 
 constexpr u32 ADDRESS_INIT_SEMAPHORE = 0x30f8;
 
-bool Load()
+bool Load(Core::System& system)
 {
-  auto& system = Core::System::GetInstance();
   auto& memory = system.GetMemory();
 
   ASSERT(Core::IsCPUThread());
@@ -67,7 +65,7 @@ bool Load()
   memory.Write_U32(0x00000000, ADDRESS_INIT_SEMAPHORE);
   memory.Write_U32(0x09142001, 0x3180);
 
-  ReinitHardware();
+  ReinitHardware(system);
   NOTICE_LOG_FMT(IOS, "Reinitialised hardware.");
 
   // Load symbols for the IPL if they exist.

Source/Core/Core/IOS/MIOS.h

@@ -3,7 +3,12 @@
 
 #pragma once
 
+namespace Core
+{
+class System;
+}
+
 namespace IOS::HLE::MIOS
 {
-bool Load();
+bool Load(Core::System& system);
 }  // namespace IOS::HLE::MIOS