kernel: Fix missing else in dump_page_queue debugger command.

The entered page queue address would always be overwritten. Pointed
out by CID 610504.
Rename display_controls to display_adapter

ACPI talks about display_adapters, and we will likely have displays
as child nodes. Displays will be attached to an adapter.
Network Preflet: Implement an IPV4TextControl which only allows numbers
and use it instead of the regular BTextControl.
Unfortunately it doesn't block multi-byte characters (to do that we
should create a subclass of BTextView and override InsertText()).
ARM: fix arch_debug_call_with_fault_handler

This fixes the problem with KDL freaking out when doing a stacktrace
and having its fault handler triggered. Have no clue how this could
have worked before, but it did :P
Revert "Added check to ensure KDL does not include frames beyond kernel entry in the backtrace. This prevents KDL from faulting when printing backtrace on ARM."

This reverts commit 3fbb24680c819d0819f4f876fe6565c336a19139.

As I mentioned in #11131, this fix is not correct, and works around
the problem. The real reason was that arch_debug_call_with_fault_handler
was not working properly, so the fault handler went crazy.

With commit eb92810 that is fixed so this can be reverted.