Make functions static (where possible) to reduce code size (trivial).

Make functions static (where possible) to reduce code size (trivial).
Also, disable header() for now, as it's not being used.

Here are some stats on size differences:

 - ls

23820 coreinfo.old.elf
23564 coreinfo.new.elf

 - size *elf

   text    data     bss     dec     hex filename
  15199    2468  181904  199571   30b93 coreinfo.old.elf
  14934    2468  181912  199314   30a92 coreinfo.new.elf

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3187 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1