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.cpp

@@ -82,7 +82,7 @@ ErrorOr<void> IDEChannel::port_phy_reset()
     return {};
 }
 
-#if ARCH(I386) || ARCH(X86_64)
+#if ARCH(X86_64)
 ErrorOr<void> IDEChannel::allocate_resources_for_pci_ide_controller(Badge<PCIIDELegacyModeController>, bool force_pio)
 {
     return allocate_resources(force_pio);