AMD Specific EIO

[Andriy Gapon]

The AMD's variant of the Specific EIO feature (or EOI Suppression) requires that
a vector number is known.  So, implementing that feature requires a change to
the Local APIC interface and its consumers.
Could you please take a look at the following review request and let me know if
you have any concerns or objections?
https://reviews.freebsd.org/D9880

Thanks!
-- 
Andriy Gapon