gpio: adp5588-gpio: irq_data conversion

Converts irq_chips and flow handlers over to the new struct irq_data based
irq_chip functions.

Signed-off-by: Lennert Buytenhek <buytenh@secretlab.ca>
Acked-by: "Hennerich, Michael" <Michael.Hennerich@analog.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>