Ensure NanoPC‑T6 reset button remains active after kernel start

[Copilot]

The NanoPC‑T6 reset button works in U‑Boot but stops once the kernel takes over, indicating the runtime kernel is missing the PMIC reset-mode device tree patch. This change ensures the reset-mode patch is applied to the custom kernel actually used at runtime.

• Kernel patch application
  • Move the NanoPC‑T6 DTS reset-mode patch into the custom kernel override so it’s applied consistently with the selected kernel package.

Example change:

customKernel = baseKernel.kernel.override {
  structuredExtraConfig = with lib.kernel; {
    MFD_RK8XX_SPI = yes;
    PINCTRL_RK805 = yes;
    INPUT_RK805_PWRKEY = yes;
  };
  kernelPatches = [
    {
      name = "rk3588-nanopc-t6.dtsi.patch";
      patch = ./rk3588-nanopc-t6.dtsi.patch;
    }
  ];
};

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