[coreboot] author for early startup code needed

[Carl-Daniel Hailfinger]

Hi,

we have a small problem in v3: Author attributions for the early
16-bit/32-bit startup code have been lost. The earliest evidence of that
code is in v2 revision 1657, committed by Eric Biederman. Some code
there has a copyright 2000 by Ron, some other code is unclear.

I'd rather avoid wrong copyright headers in a new file in v3.

Regards,
Carl-Daniel