ARM: Tegra: Trimslice: Tri-state DAP3 pinmux

DAP3 is used for a bunch of GPIOs. Not tri-stating the pins means audio
signals get sent out there, and this ends up resetting USB and breaking
SDHCI too.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>