pinctrl: tegra: Consistently refer to SoC data

The SoC-specific data is stored in pmx->soc and that's used throughout
the driver to access this data. The probe function has access to a local
version of that copy and uses it in some occasions. Replace them with
the more standard pmx->soc access for more consistency.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230530105308.1292852-2-thierry.reding@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>