tegra: colibri_t30: asix usb ethernet reset regression

Fix ASIX USB to Ethernet reset which due to the new driver model Tegra
GPIO driver changes now requires a label string to be provided
otherwise the reservation and subsequent direction/value calls will
fail.

This fixes a regression introduced by commit:

2fccd2d9
tegra: Convert tegra GPIO driver to use driver model

Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>