From: Eric W. Biederman <ebiederm@xmission.com

The following patch simply adds a shutdown method to the x86_64 i8259 code.
Signed-off-by: NEric Biederman <ebiederm@xmission.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>