gpio: mvebu: Fix cause computation in irq handler

When switching to regmap, the way to compute the irq cause was
reorganized. However while doing it, a typo was introduced: a 'xor'
replaced a 'and'.

This lead to wrong behavior in the interrupt handler ans one of the
symptom was wrong irq handler called on the Armada 388 GP:
"->handle_irq(): c016303c,
handle_bad_irq+0x0/0x278
->irq_data.chip(): c0b0ec0c,
0xc0b0ec0c
->action(): (null)
IRQ_NOPROBE set
IRQ_NOREQUEST set
unexpected IRQ trap at vector 00
irq 0, desc: ee804800, depth: 1, count: 0, unhandled: 0"

Fixes: 2233bf7a92e7 ("gpio: mvebu: switch to regmap for register access")
Signed-off-by: Gregory CLEMENT <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-mvebu.c

···
 	edge_cause = mvebu_gpio_read_edge_cause(mvchip);
 	edge_mask  = mvebu_gpio_read_edge_mask(mvchip);
 
-	cause = (data_in ^ level_mask) | (edge_cause & edge_mask);
+	cause = (data_in & level_mask) | (edge_cause & edge_mask);
 
 	for (i = 0; i < mvchip->chip.ngpio; i++) {
 		int irq;