[AVR32] Implement intc_get_pending()

intc_get_pending() returns a bitmask with pending interrupts in a
interrupt controller group (irq). This is used by the upcoming
oprofile implementation for avr32 and may also be useful for chained
interrupt controller drivers.
Signed-off-by: NHaavard Skinnemoen <hskinnemoen@atmel.com>

arch/avr32/mach-at32ap/intc.c

@@ -136,3 +136,7 @@ void __init init_IRQ(void)
 	panic("Interrupt controller initialization failed!\n");
 }
 
+unsigned long intc_get_pending(int group)
+{
+	return intc_readl(&intc0, INTREQ0 + 4 * group);
+}