AMD boards: Fix typos

Change-Id: If1dc4fd2204a2e4b6f84c75f385b8ff958d2251d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6112
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
4 files changed