"extern" is always implied with function declarations.
Also remove the comment as the linker will just tell you the same if a
definition is missing.
Change-Id: I53679ab57981790f82affb46a006281b348af574
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71869
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
1d380128aa