[coreboot] Baytrail issue to communicate with superios.

[Jose Trujillo]

Dear Rudolf/All,

Today I patched superiotool to add support for Fintek F81803A and dumped both superios, and I found that LPC clock must be set at 24MHz on Fintek global control register #26 from the default 48MHz.

So, now I am working on it, looking how to set correctly this register.

Thank you,
JT.