[TODO] Clock output functionality not implemented

[smdn]

The interface is not definite.

Smdn.Devices.MCP2221/src/Smdn.Devices.MCP2221/Smdn.Devices.MCP2221/MCP2221.GPs.ClockOutput.cs

Lines 10 to 20 in 1931ceb

	internal interface IClockOutputFunctionality {
	ValueTask ConfigureAsClockOutputAsync(
	CancellationToken cancellationToken = default
	);
	void ConfigureAsClockOutput(
	CancellationToken cancellationToken = default
	);
	#if __FUTURE_VERSION
	int ClockFrequency { get; set; }
	#endif
	}