arm64: tegra: p3310: Explicitly enable GPU

arm64: tegra: p3310: Explicitly enable GPU

The gpu node originally was explicitly left disabled as it was expected
for the bootloader to enable it. However, this is only done in U-Boot.
If U-Boot is not in the boot chain, this will never be enabled. Other
Tegra186 devices already explicitly enable the GPU, so make p3310 match.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
Link: https://lore.kernel.org/r/20250426-tx2-gpu-v1-1-fa1c78dcdbdc@gmail.com
Signed-off-by: Thierry Reding <treding@nvidia.com>