Kernel: Remove now obsolete CriticalScope

All critical scopes in kernel are now replaced by SpinLocks. This
allows proper locking in actual multiprocessing with multiple cores.

kernel/include/kernel/CriticalScope.h

@@ -1,30 +0,0 @@
-#pragma once
-
-#include <BAN/NoCopyMove.h>
-
-#include <stddef.h>
-
-namespace Kernel
-{
-
-	class CriticalScope
-	{
-		BAN_NON_COPYABLE(CriticalScope);
-		BAN_NON_MOVABLE(CriticalScope);
-
-	public:
-		CriticalScope()
-		{
-			asm volatile("pushf; cli; pop %0" : "=r"(m_flags) :: "memory");
-		}
-
-		~CriticalScope()
-		{
-			asm volatile("push %0; popf" :: "rm"(m_flags) : "memory", "cc");
-		}
-
-	private:
-		size_t m_flags;
-	};
-
-}

kernel/kernel/Storage/DiskCache.cpp

@@ -1,4 +1,3 @@
-#include <kernel/CriticalScope.h>
 #include <kernel/Lock/LockGuard.h>
 #include <kernel/Memory/Heap.h>
 #include <kernel/Memory/PageTable.h>