arm64: tegra: Remove 'enable-active-low'

The 'enable-active-low' property is not a valid one.

Only 'enable-active-high' is valid, and when this property is absent
the gpio regulator will act as active low by default.

Remove the invalid 'enable-active-low' property.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>