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/Firmware/ACPI/Parser.cpp

@@ -11,7 +11,7 @@
 #include <AK/StringView.h>
 #include <AK/Try.h>
 #include <Kernel/InterruptDisabler.h>
-#if ARCH(I386) || ARCH(X86_64)
+#if ARCH(X86_64)
 #    include <Kernel/Arch/x86/IO.h>
 #endif
 #include <Kernel/Bus/PCI/API.h>
@@ -234,7 +234,7 @@ void Parser::access_generic_address(Structures::GenericAddressStructure const& s
 {
     switch ((GenericAddressStructure::AddressSpace)structure.address_space) {
     case GenericAddressStructure::AddressSpace::SystemIO: {
-#if ARCH(I386) || ARCH(X86_64)
+#if ARCH(X86_64)
         IOAddress address(structure.address);
         dbgln("ACPI: Sending value {:x} to {}", value, address);
         switch (structure.access_size) {