genirq: Mirror irq trigger type bits in irq_data.state

That's the data structure chip functions get provided. Also allow them
to signal the core code that they updated the flags in irq_data.state
by returning IRQ_SET_MASK_OK_NOCOPY. The default is unchanged.

The type bits should be accessed via:

val = irqd_get_trigger_type(irqdata);
and
irqd_set_trigger_type(irqdata, val);

Coders who access them directly will be tracked down and slapped with
stinking trouts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/irq/resend.c

@@ -60,7 +60,7 @@ void check_irq_resend(struct irq_desc *desc, unsigned int irq)
 	 * interrupts are resent by hardware when they are still
 	 * active.
 	 */
-	if (desc->status & IRQ_LEVEL)
+	if (irq_settings_is_level(desc))
 		return;
 	if (desc->istate & IRQS_REPLAY)
 		return;