pinctrl: tegra: add clfvs function to Tegra114 support

This patch adds the definition for the cldvfs function for Tegra114 pinctrl
support. This is based on work by Pritesh Raithatha.

Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>