- removes unneeded irq_chip.irq_eoi callback
- adds irq_chip.irq_set_wake callback for possible
  in the future GPIO wakeup
- adds irq_chip.irq_ack callback
Signed-off-by: NRadoslaw Pietrzyk <radoslaw.pietrzyk@gmail.com>
Reviewed-by: NLudovic Barre <ludovic.barre@st.com>
Tested-by: NLudovic Barre <ludovic.barre@st.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>