mfd: Kill off set_irq_flags usage

set_irq_flags is ARM specific with custom flags which have genirq
equivalents. Convert drivers to use the genirq interfaces directly, so we
can kill off set_irq_flags. The translation of flags is as follows:

IRQF_VALID -> !IRQ_NOREQUEST
IRQF_PROBE -> !IRQ_NOPROBE
IRQF_NOAUTOEN -> IRQ_NOAUTOEN

For IRQs managed by an irqdomain, the irqdomain core code handles clearing
and setting IRQ_NOREQUEST already, so there is no need to do this in
.map() functions and we can simply remove the set_irq_flags calls. Some
users also modify IRQ_NOPROBE and this has been maintained although it
is not clear that is really needed. There appears to be a great deal of
blind copy and paste of this code.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/ezx-pcap.c

@@ -463,11 +463,7 @@ static int ezx_pcap_probe(struct spi_device *spi)
 	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++) {
 		irq_set_chip_and_handler(i, &pcap_irq_chip, handle_simple_irq);
 		irq_set_chip_data(i, pcap);
-#ifdef CONFIG_ARM
-		set_irq_flags(i, IRQF_VALID);
-#else
-		irq_set_noprobe(i);
-#endif
+		irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
 	}
 
 	/* mask/ack all PCAP interrupts */