Revert "pinctrl: generic: Add bi-directional and output-enable"

This reverts commit 8c58f1a7

.

It turns out that applying these generic properties was
premature: the properties used in the driver using this
are of unclear electrical nature and the subject need to
be discussed.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>