gpio: sx150x: 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>
Cc: Gregory Bean <gbean@codeaurora.org>
Tested-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>