kernel/physical_core: Remove unused kernel reference member variable

This isn't used within the class, so it can be removed to simplify the
overall interface.

While we're in the same area, we can simplify a unique_ptr reset() call.

src/core/hle/kernel/kernel.cpp

@@ -101,7 +101,7 @@ struct KernelCore::Impl {
     void Initialize(KernelCore& kernel) {
         Shutdown();
 
-        InitializePhysicalCores(kernel);
+        InitializePhysicalCores();
         InitializeSystemResourceLimit(kernel);
         InitializeThreads();
         InitializePreemption();
@@ -131,14 +131,14 @@ struct KernelCore::Impl {
         }
         cores.clear();
 
-        exclusive_monitor.reset(nullptr);
+        exclusive_monitor.reset();
     }
 
-    void InitializePhysicalCores(KernelCore& kernel) {
+    void InitializePhysicalCores() {
         exclusive_monitor =
             Core::MakeExclusiveMonitor(system.Memory(), global_scheduler.CpuCoresCount());
         for (std::size_t i = 0; i < global_scheduler.CpuCoresCount(); i++) {
-            cores.emplace_back(system, kernel, i, *exclusive_monitor);
+            cores.emplace_back(system, i, *exclusive_monitor);
         }
     }
 

src/core/hle/kernel/physical_core.cpp

@@ -10,16 +10,15 @@
 #include "core/arm/exclusive_monitor.h"
 #include "core/arm/unicorn/arm_unicorn.h"
 #include "core/core.h"
-#include "core/hle/kernel/kernel.h"
 #include "core/hle/kernel/physical_core.h"
 #include "core/hle/kernel/scheduler.h"
 #include "core/hle/kernel/thread.h"
 
 namespace Kernel {
 
-PhysicalCore::PhysicalCore(Core::System& system, KernelCore& kernel, std::size_t id,
+PhysicalCore::PhysicalCore(Core::System& system, std::size_t id,
                            Core::ExclusiveMonitor& exclusive_monitor)
-    : core_index{id}, kernel{kernel} {
+    : core_index{id} {
 #ifdef ARCHITECTURE_x86_64
     arm_interface = std::make_shared<Core::ARM_Dynarmic>(system, exclusive_monitor, core_index);
 #else

src/core/hle/kernel/physical_core.h

@@ -21,9 +21,7 @@ namespace Kernel {
 
 class PhysicalCore {
 public:
-    PhysicalCore(Core::System& system, KernelCore& kernel, std::size_t id,
-                 Core::ExclusiveMonitor& exclusive_monitor);
-
+    PhysicalCore(Core::System& system, std::size_t id, Core::ExclusiveMonitor& exclusive_monitor);
     ~PhysicalCore();
 
     /// Execute current jit state
@@ -66,7 +64,6 @@ public:
 
 private:
     std::size_t core_index;
-    KernelCore& kernel;
     std::shared_ptr<Core::ARM_Interface> arm_interface;
     std::shared_ptr<Kernel::Scheduler> scheduler;
 };