pinctrl: intel: Use GPIO direction definitions

Use new GPIO_LINE_DIRECTION_IN and GPIO_LINE_DIRECTION_OUT when
returning GPIO direction to GPIO framework.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>