Remove duplicated line of code in AMD wrappers.

Remove duplicated line of code in AMD wrappers.

This line was unnecessary and was duplicated on several mainboards.

Change-Id: I438da05c770ded0bd32256f1c157cabcc383667a
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: http://review.coreboot.org/541
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>