x86: mpspec: Move writing ISA interrupt entry after PCI
On some platforms the I/O APIC interrupt pin#0-15 may be connected to platform pci devices' interrupt pin. In such cases the legacy ISA IRQ is not available so we should not write ISA interrupt entry if it is already occupied. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Acked-by: NSimon Glass <sjg@chromium.org>
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