Kernel: Move PCSpeaker code to the x86-specific architecture directory

The PCSpeaker code is specific to x86 platforms, thus it makes sense to
put in the Arch/x86 subdirectory.

Kernel/Arch/x86/common/PCSpeaker.cpp

@@ -5,7 +5,7 @@
  */
 
 #include <Kernel/Arch/x86/IO.h>
-#include <Kernel/Devices/PCSpeaker.h>
+#include <Kernel/Arch/x86/common/PCSpeaker.h>
 #include <Kernel/Time/PIT.h>
 
 void PCSpeaker::tone_on(int frequency)

Kernel/CMakeLists.txt

@@ -59,7 +59,6 @@ set(KERNEL_SOURCES
     Devices/MemoryDevice.cpp
     Devices/NullDevice.cpp
     Devices/PCISerialDevice.cpp
-    Devices/PCSpeaker.cpp
     Devices/RandomDevice.cpp
     Devices/SelfTTYDevice.cpp
     Devices/SerialDevice.cpp
@@ -335,6 +334,7 @@ if ("${SERENITY_ARCH}" STREQUAL "i686" OR "${SERENITY_ARCH}" STREQUAL "x86_64")
         Arch/x86/common/DebugOutput.cpp
         Arch/x86/common/Delay.cpp
         Arch/x86/common/I8042Reboot.cpp
+        Arch/x86/common/PCSpeaker.cpp
         Arch/x86/common/RTC.cpp
         Arch/x86/common/ScopedCritical.cpp
         Arch/x86/common/SmapDisabler.cpp

Kernel/Syscalls/beep.cpp

@@ -5,7 +5,9 @@
  */
 
 #include <Kernel/CommandLine.h>
-#include <Kernel/Devices/PCSpeaker.h>
+#if ARCH(I386) || ARCH(X86_64)
+#    include <Kernel/Arch/x86/common/PCSpeaker.h>
+#endif
 #include <Kernel/Process.h>
 
 namespace Kernel {
@@ -15,12 +17,16 @@ ErrorOr<FlatPtr> Process::sys$beep()
     VERIFY_NO_PROCESS_BIG_LOCK(this);
     if (!kernel_command_line().is_pc_speaker_enabled())
         return ENODEV;
+#if ARCH(I386) || ARCH(X86_64)
     PCSpeaker::tone_on(440);
     auto result = Thread::current()->sleep(Time::from_nanoseconds(200'000'000));
     PCSpeaker::tone_off();
     if (result.was_interrupted())
         return EINTR;
     return 0;
+#else
+    return ENOTIMPL;
+#endif
 }
 
 }

Kernel/TTY/VirtualConsole.cpp

@@ -8,11 +8,13 @@
 
 #include <AK/StdLibExtras.h>
 #include <Kernel/Arch/Delay.h>
+#if ARCH(I386) || ARCH(X86_64)
+#    include <Kernel/Arch/x86/common/PCSpeaker.h>
+#endif
 #include <Kernel/CommandLine.h>
 #include <Kernel/Debug.h>
 #include <Kernel/Devices/DeviceManagement.h>
 #include <Kernel/Devices/HID/HIDManagement.h>
-#include <Kernel/Devices/PCSpeaker.h>
 #include <Kernel/Graphics/GraphicsManagement.h>
 #include <Kernel/Heap/kmalloc.h>
 #include <Kernel/Sections.h>
@@ -327,9 +329,11 @@ void VirtualConsole::beep()
 {
     if (!kernel_command_line().is_pc_speaker_enabled())
         return;
+#if ARCH(I386) || ARCH(X86_64)
     PCSpeaker::tone_on(440);
     microseconds_delay(10000);
     PCSpeaker::tone_off();
+#endif
 }
 
 void VirtualConsole::set_window_title(StringView)