Fix for sparc64 irq.c compile error

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Hello.

Please excuse me for contacting you so bluntly, but after some hours of=20
debugging, I feel the need to contribute my little patch, in the hope it=20
is somewhat helpful.

The problem: On sparc64, arch/sparc64/kernel/irq.c is missing the=20
inclusion of asm/io.h, which causes readb() and writeb() to be undefined.=
=20
Please see the attached patch for the correction.

This should also go into the -stable-series.

Gr=FC=DFe,
Sven Hartge

--=20
Sven Hartge -- professioneller Unix-Geek
Meine Gedanken im Netz: http://sven.formvision.de/blog/
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