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Patch from Eugene to do some cleanup of the PPC4xx PIC code.  Separates the
interrupts that can have polarity/triggering modified for platform
modification if necessary.  Between the two of us, it's tested on most of
the affected platforms.
Signed-off-by: Eugene Surovegin <ebs@ebshome.net>
Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>