Kernel: Move AC'97 to its own subdirectory

Kernel/CMakeLists.txt

@@ -42,7 +42,7 @@ set(KERNEL_SOURCES
     Bus/VirtIO/Queue.cpp
     Bus/VirtIO/RNG.cpp
     Devices/AsyncDeviceRequest.cpp
-    Devices/Audio/AC97.cpp
+    Devices/Audio/AC97/AC97.cpp
     Devices/Audio/Channel.cpp
     Devices/Audio/IntelHDA/Codec.cpp
     Devices/Audio/IntelHDA/Controller.cpp

Kernel/Devices/Audio/AC97/AC97.cpp

@@ -6,7 +6,7 @@
 
 #include <AK/Format.h>
 #include <Kernel/Arch/Delay.h>
-#include <Kernel/Devices/Audio/AC97.h>
+#include <Kernel/Devices/Audio/AC97/AC97.h>
 #include <Kernel/Devices/DeviceManagement.h>
 #include <Kernel/Interrupts/InterruptDisabler.h>
 #include <Kernel/Memory/AnonymousVMObject.h>

Kernel/Devices/Audio/Management.cpp

@@ -7,7 +7,7 @@
 #include <AK/Singleton.h>
 #include <Kernel/Bus/PCI/API.h>
 #include <Kernel/Bus/PCI/IDs.h>
-#include <Kernel/Devices/Audio/AC97.h>
+#include <Kernel/Devices/Audio/AC97/AC97.h>
 #include <Kernel/Devices/Audio/IntelHDA/Controller.h>
 #include <Kernel/Devices/Audio/Management.h>
 #include <Kernel/Sections.h>