Revert "pinctrl: msm: Configure interrupts as input and gpio mode"

This reverts commit fe273121.

By default the commit muxes the pin to a GPIO upon a request_irq()
call from the client driver. This is incorrect as the client driver
could have muxed the pin already for a different purpose. Hence,
revert this default behavior to not enforce this on the clients.

Change-Id: Ib2500f57cf7e49a7bffd3309801e42166b748db9
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>