ARM: tegra: Remove spurious comma from node name

This was probably left there by mistake or perhaps was a typo in the
first place. Remove it.

Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Cc: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>