pinctrl: tegra: Add SFIO/GPIO programming on Tegra194

Prior to Tegra186, the selection of SFIO vs. GPIO modes was done as part
of the GPIO controller's register programming. Starting with Tegra186, a
pin is configured as GPIO or SFIO with a bit in a configuration register
of the pin controller.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200319122737.3063291-10-thierry.reding@gmail.com


Tested-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>