See the definition of the TEGRA_GPIO(bank, offset) macro in dt-bindings/gpio/tegra_gpio.h file to understand what number to use in the device tree source.
You can look up the name of the pin and sometimes the bank and offset in the pinmux spreadsheet. The bank and offset should be the PX.YY suffix at the end of the name, e.g., for gpio63 = BT_WAKE_AP = PH.06 the number calculated by the TEGRA_GPIO macro would be for bank H, offset 06: 7 * 8 + 6 = 62.
If that is not the actual bank or offset, you can find the actual values in the .dts or source files. Let me know what works please, I’d be interested in having a heartbeat LED too.