[IA64] remove obsolete hw_interrupt_type

The defines and typedefs (hw_interrupt_type, no_irq_type, irq_desc_t) have
been kept around for migration reasons.  After more than two years it's
time to remove them finally.

This patch cleans up one of the remaining users.  When all such patches
hit mainline we can remove the defines and typedefs finally.

Impact: cleanup

Convert the last remaining users to struct irq_chip and remove the
define.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/include/asm/hw_irq.h b/arch/ia64/include/asm/hw_irq.h
index 276f9d4..91619b3 100644
--- a/arch/ia64/include/asm/hw_irq.h
+++ b/arch/ia64/include/asm/hw_irq.h
@@ -106,7 +106,7 @@
 #define irq_to_domain(x)	irq_cfg[(x)].domain
 DECLARE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq);
 
-extern struct hw_interrupt_type irq_type_ia64_lsapic;	/* CPU-internal interrupt controller */
+extern struct irq_chip irq_type_ia64_lsapic;	/* CPU-internal interrupt controller */
 
 #ifdef CONFIG_PARAVIRT_GUEST
 #include <asm/paravirt.h>