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/include/asm/hardware/gic.h b/arch/arm/include/asm/hardware/gic.h
index a82a777..84557d3 100644
--- a/arch/arm/include/asm/hardware/gic.h
+++ b/arch/arm/include/asm/hardware/gic.h
@@ -39,6 +39,7 @@
 void gic_secondary_init(unsigned int);
 void gic_cascade_irq(unsigned int gic_nr, unsigned int irq);
 void gic_raise_softirq(const struct cpumask *mask, unsigned int irq);
+void gic_enable_ppi(unsigned int);
 #endif
 
 #endif