drm/exynos: dsi: do not set TE GPIO direction by input

On some board, TE GPIO should be configured properly thoughout pinctrl driver
as an wakeup interrupt. So this gpio should be configurable in the board's DT,
not being requested as a input pin.

Signed-off-by: Hyungwon Hwang <human.hwang@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>