ARM: tegra: apalis-eval: Set OTG dr_mode

This has currently no functional effect as neither USB device nor OTG
is currently supported on any Tegras in mainline as of yet. However
once we use the same device tree on U-Boot this will actually make it
work properly there.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>