powerpc: xilinx: Cleanup flow type handling

The core irq_set_type() function updates the flow type when the chip
callback returns 0. So setting the type is bogus. The core also
updates the LEVEL flag.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/powerpc/sysdev/xilinx_intc.c

@@ -79,12 +79,6 @@ static void xilinx_intc_mask(struct irq_data *d)
 
 static int xilinx_intc_set_type(struct irq_data *d, unsigned int flow_type)
 {
-	struct irq_desc *desc = irq_to_desc(d->irq);
-
-	desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
-	desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
-	if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
-		desc->status |= IRQ_LEVEL;
 	return 0;
 }