alpha: 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>
Cc: Richard Henderson <rth@twiddle.net>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/alpha/kernel/sys_titan.c b/arch/alpha/kernel/sys_titan.c
index 8dd239e..88978fc 100644
--- a/arch/alpha/kernel/sys_titan.c
+++ b/arch/alpha/kernel/sys_titan.c
@@ -185,7 +185,7 @@
 
 
 static void __init
-init_titan_irqs(struct hw_interrupt_type * ops, int imin, int imax)
+init_titan_irqs(struct irq_chip * ops, int imin, int imax)
 {
 	long i;
 	for (i = imin; i <= imax; ++i) {
@@ -194,7 +194,7 @@
 	}
 }
 
-static struct hw_interrupt_type titan_irq_type = {
+static struct irq_chip titan_irq_type = {
        .typename       = "TITAN",
        .startup        = titan_startup_irq,
        .shutdown       = titan_disable_irq,