superio/fintek/f71859: Avoid .c includes

Following the same reasoning as commit
d304331 superio/fintek/f81865f: Avoid .c includes
Clean up the early_serial #include directives in mainboard/romstage code.

Change-Id: I3577ca3f761fb699dc51141a02e1f853bf1f1a21
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5417
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
4 files changed