pinctrl: remove bindings for pinconf options needing more thought

pinctrl: remove bindings for pinconf options needing more thought

Some options currently take arguments in unspecified driver-specific units.
As pointed out by Stephen Warren, driver specific values should not be part
of generic devicetree bindings describing the hardware.

Therefore remove the critical bindings again, before they become part of
an official release.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 5b81d55c4ccf23b9de398f819571dfc8941c7b04)
Signed-off-by: Mark Brown <broonie@linaro.org>