is reverts commit 2531d64b6fe2724dc432b67d8dc66bd45621da0b.

The two patches:
      x86/apic: Replace io_apic_ops with x86_io_apic_ops.
      xen/x86: Implement x86_apic_ops

take care of fixing it properly.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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