Kernel/Graphics: Move x86-specific support for VGA to Arch/x86 directory

The new VGAIOArbiter class is now responsible to conduct x86-specific
instructions to control VGA hardware from the old ISA ports. This allows
us to ensure the GraphicsManagement code doesn't use x86-specific code,
thus allowing it to be compiled within non-x86 kernel builds.

Kernel/Arch/x86/VGA/IOArbiter.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/NonnullOwnPtr.h>
+#include <AK/Platform.h>
+#include <AK/Types.h>
+#include <Kernel/Locking/Spinlock.h>
+
+namespace Kernel {
+
+class GraphicsManagement;
+class VGAIOArbiter {
+public:
+    static NonnullOwnPtr<VGAIOArbiter> must_create(Badge<GraphicsManagement>);
+
+    void disable_vga_emulation_access_permanently(Badge<GraphicsManagement>);
+    void enable_vga_text_mode_console_cursor(Badge<GraphicsManagement>);
+    void disable_vga_text_mode_console_cursor(Badge<GraphicsManagement>);
+    void set_vga_text_mode_cursor(Badge<GraphicsManagement>, size_t console_width, size_t x, size_t y);
+
+    void unblank_screen(Badge<GraphicsManagement>);
+
+    ~VGAIOArbiter();
+
+private:
+    VGAIOArbiter();
+
+    void disable_vga_text_mode_console_cursor();
+    void enable_vga_text_mode_console_cursor();
+
+    RecursiveSpinlock m_main_vga_lock { LockRank::None };
+    bool m_vga_access_is_disabled { false };
+};
+
+}