gpio: tegra186: Simplify GPIO line name prefix handling

gpio: tegra186: Simplify GPIO line name prefix handling

Introduce TEGRA_GPIO_PREFIX() to define the Tegra SoC GPIO name
prefix in one place. Use it for the Tegra410 COMPUTE and SYSTEM
controllers so the prefix is "COMPUTE-" and "SYSTEM-" respectively.

Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://patch.msgid.link/20260217081431.1208351-1-pshete@nvidia.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>