Kernel: Remove i686 support

Author: https://github.com/supercomputer7
Commit: 5ff318cf3a
Pull-request: https://github.com/SerenityOS/serenity/pull/15467
Issue: https://github.com/SerenityOS/serenity/issues/15444
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/fuel-pcbox

Kernel/Storage/ATA/GenericIDE/Channel.h

@@ -36,7 +36,7 @@ namespace Kernel {
 class AsyncBlockDeviceRequest;
 
 class IDEController;
-#if ARCH(I386) || ARCH(X86_64)
+#if ARCH(X86_64)
 class PCIIDELegacyModeController;
 class ISAIDEController;
 #endif
@@ -95,7 +95,7 @@ public:
 
     virtual StringView purpose() const override { return "PATA Channel"sv; }
 
-#if ARCH(I386) || ARCH(X86_64)
+#if ARCH(X86_64)
     ErrorOr<void> allocate_resources_for_pci_ide_controller(Badge<PCIIDELegacyModeController>, bool force_pio);
     ErrorOr<void> allocate_resources_for_isa_ide_controller(Badge<ISAIDEController>);
 #endif