Remove remaining ACPI tooling bits

Builtin ACPI support was removed before. Now clean remaining
tooling bits.

Fixes: 35aa9a72c279 ("drop obsolete acpi table code")
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>