Add support for pin output control through the pinctrl config:
 - support enabling/disabling output on a given pin
 - support output level setting (high or low)
Signed-off-by: NBoris BREZILLON <b.brezillon@overkiz.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NWenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>