drm/tegra: dpaux: Add pinctrl support
The DPAUX pins are shared with an internal I2C controller. To allow these pins to be muxed to the I2C controller, register a pinctrl device for the DPAUX device. This is based upon work by Thierry Reding <treding@nvidia.com>. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
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