ppc: Adapt to asm-powerpc/irq.h irq_canonicalize changes

Now instead of having a ppc_md function, we just have a variable
which says whether to do the i8259 irq canonicalization or not,
and set that variable on the platforms that need that.  It looks
to me that radstone_ppc7d was trying to use irq canonicalization
for something else in a broken kind of way - it will need to be
fixed properly.

Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/ppc/kernel/setup.c b/arch/ppc/kernel/setup.c
index 62022ea..fae6335 100644
--- a/arch/ppc/kernel/setup.c
+++ b/arch/ppc/kernel/setup.c
@@ -87,6 +87,11 @@
 dev_t boot_dev;
 #endif /* CONFIG_PPC_MULTIPLATFORM */
 
+#ifdef __DO_IRQ_CANON
+int ppc_do_canonicalize_irqs;
+EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
+#endif
+
 #ifdef CONFIG_MAGIC_SYSRQ
 unsigned long SYSRQ_KEY = 0x54;
 #endif /* CONFIG_MAGIC_SYSRQ */