ARM: GIC: move enablement of PPI interrupts to gic.c

Avoid adding nasty genirq-specific code to local timers to enable PPI
interrupts.  Instead, provide a gic function to do this.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index 35882fb..67f933e 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -127,8 +127,6 @@
  */
 void __cpuinit twd_timer_setup(struct clock_event_device *clk)
 {
-	unsigned long flags;
-
 	twd_calibrate_rate();
 
 	clk->name = "local_timer";
@@ -143,10 +141,7 @@
 	clk->min_delta_ns = clockevent_delta2ns(0xf, clk);
 
 	/* Make sure our local interrupt controller has this enabled */
-	local_irq_save(flags);
-	irq_to_desc(clk->irq)->status |= IRQ_NOPROBE;
-	get_irq_chip(clk->irq)->unmask(clk->irq);
-	local_irq_restore(flags);
+	gic_enable_ppi(clk->irq);
 
 	clockevents_register_device(clk);
 }