Tegra has several pinctrl drivers.  Now it is reasonable enough to
move them into drivers/pinctrl/tegra/.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>