[POWERPC] Fix ohare IDE irq workaround on old powermacs
Looks like a workaround for old bogus OF bitrot... This fixes it and hence fixes boot on some performa machines. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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