Kernel/Storage: Don't try to enumerate PCI adapters if PCI is disabled

If there's no PCI bus, then it's safe to assume that we run on a x86
machine that has an ISA IDE controller in the system. In such case, we
just instantiate a ISAIDEController object that assumes fixed locations
of IDE IO ports.

Kernel/Storage/ATA/ISAIDEController.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/IDEChannel.h>
+#include <Kernel/Storage/ATA/IDEController.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();
+};
+}