Kernel: replace usage of Core::System::GetInstance()::Timing()

src/core/hle/kernel/kernel.h

@@ -27,6 +27,10 @@ namespace Memory {
 class MemorySystem;
 }
 
+namespace Core {
+class Timing;
+}
+
 namespace Kernel {
 
 class AddressArbiter;
@@ -78,7 +82,7 @@ using SharedPtr = boost::intrusive_ptr<T>;
 
 class KernelSystem {
 public:
-    explicit KernelSystem(Memory::MemorySystem& memory, u32 system_mode);
+    explicit KernelSystem(Memory::MemorySystem& memory, Core::Timing& timing, u32 system_mode);
     ~KernelSystem();
 
     /**
@@ -229,6 +233,8 @@ public:
 
     Memory::MemorySystem& memory;
 
+    Core::Timing& timing;
+
 private:
     void MemoryInit(u32 mem_type);