pinctrl: Adds slew-rate, input-enable/disable

This commit adds slew-rate and input-enable/disable support for pinconf
-generic.

Signed-off-by: Sherman Yin <syin@broadcom.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 8ba3f4d00078e7a49c60c0bd6298f29402c3a0a0)
Signed-off-by: Mark Brown <broonie@linaro.org>
3 files changed