ARM: tegra: nyan-big: Proper pinmux for TPM I2C

This corrects the pinmux for accessing the TPM over the I2C line. Thus,
it allows correctly probing the module, that previously failed with I2C
errors.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Signed-off-by: Thierry Reding <treding@nvidia.com>