microblaze: Remove deprecated IRQF_DISABLED

Removed IRQF_DISABLED as it's no-op and should be removed.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/microblaze/kernel/timer.c

@@ -148,7 +148,7 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
 
 static struct irqaction timer_irqaction = {
 	.handler = timer_interrupt,
-	.flags = IRQF_DISABLED | IRQF_TIMER,
+	.flags = IRQF_TIMER,
 	.name = "timer",
 	.dev_id = &clockevent_xilinx_timer,
 };