Kernel/Storage: Move AHCI and IDE code into new subdirectories

We do that to increase clarity of the major and secondary components in
the subsystem. To ensure it's even more understandable, we rename the
files to better represent the class within them and to remove redundancy
in the name.

Also, some includes are removed from the general components of the ATA
components' classes.

Kernel/Storage/ATA/GenericIDE/ISAController.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/OwnPtr.h>
+#include <AK/RefPtr.h>
+#include <AK/Types.h>
+#include <Kernel/Storage/ATA/GenericIDE/Channel.h>
+#include <Kernel/Storage/ATA/GenericIDE/Controller.h>
+#include <Kernel/Storage/StorageDevice.h>
+
+namespace Kernel {
+
+class AsyncBlockDeviceRequest;
+
+class ISAIDEController final : public IDEController {
+public:
+    static NonnullRefPtr<ISAIDEController> initialize();
+
+private:
+    ISAIDEController();
+
+    RefPtr<StorageDevice> device_by_channel_and_position(u32 index) const;
+    void initialize_channels();
+};
+}