Kernel: Move IO delay code to x86 architecture subdirectory

Many code patterns and hardware procedures rely on reliable delay in the
microseconds granularity, and since they are using such delays which are
valid cases, but should not rely on x86 specific code, we allow to
determine in compile time the proper platform-specific code to use to
invoke such delays.

Kernel/TTY/VirtualConsole.cpp

@@ -7,6 +7,7 @@
  */
 
 #include <AK/StdLibExtras.h>
+#include <Kernel/Arch/Delay.h>
 #include <Kernel/CommandLine.h>
 #include <Kernel/Debug.h>
 #include <Kernel/Devices/DeviceManagement.h>
@@ -327,7 +328,7 @@ void VirtualConsole::beep()
     if (!kernel_command_line().is_pc_speaker_enabled())
         return;
     PCSpeaker::tone_on(440);
-    IO::delay(10000);
+    microseconds_delay(10000);
     PCSpeaker::tone_off();
 }