[U-Boot] RFC: Remove CONFIG_SERIAL_SOFTWARE_FIFO

Hi,

I just stumbled (again) upon the quite old define "CONFIG_SERIAL_SOFTWARE_FIFO". I never used it, and always wondered if its really useful. Checking the current config headers, no board sets this define. Only PPC4xx has it implemented. I'm suggesting to clean this up a bit, and remove this define completely.

If nobody objects, I'll create a patch to remove this code in the next few days.

Comments?

Cheers, Stefan

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