Extend the tca6416 driver to use enable_irq_wake() and disable_irq_wake()
in the suspend/resume hooks.

This makes it possible to wake up from suspend-to-ram using a tca6416 key
on the sh7372 mackerel board.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>