Kernel/Graphics: Move all VGA related methods to GraphicsManagement

This helps solving an issue when we boot with text mode screen so the
Kernel initializes an early text mode console, but even after disabling
it, that console can still access VGA ports. This wouldn't be a problem
for emulated hardware but bare metal hardware might have a "conflict",
especially if the native driver explicitly request to disable the VGA
emulation.

Kernel/Graphics/Console/TextModeConsole.h

@@ -39,6 +39,8 @@ private:
     TextModeConsole();
 
     mutable Spinlock m_vga_lock;
+    size_t m_cursor_x { 0 };
+    size_t m_cursor_y { 0 };
 
     VirtualAddress m_current_vga_window;
 };