x86: qemu: Enable I/O APIC chip select on PIIX3
The PIIX3 chipset does not integrate an I/O APIC, instead it supports connecting to an external I/O APIC which needs to be enabled manually. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Acked-by: NSimon Glass <sjg@chromium.org>
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