[coreboot] [PATCH]Include headers instead of sources in romstage, part 2/many

[Patrick Georgi]

Hi,

attached patch completes the changes from the first part, by eliminating
the direct inclusion of pc80/serial.c in all romstage.c files.
So far, they were still around in ROMCC builds.

I moved the include to console/console.h, guarded so it's only included
for ROMCC, as this file is a direct consumer of the functions in
pc80/serial.c

It's abuild tested and

Signed-off-by: Patrick Georgi