S2 alternate functions

[bugadani]

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[Dominaezzz]

All the functions look correctly mapped.

What about the CLK_OUTn functions? I'm guessing they're left out because the other chips left them out too.

[bugadani]

What about the CLK_OUTn functions?

They are somewhat special, I didn't find esp-idf to support those either so I just ignored them. They seem to be for outputting I2S clocks, but the way they need to be configured isn't exactly compatible with the rest of the alternate functions.

[jessebraham]

Thanks, LGTM