AGESA f15 f15tn f16kb: Add extra checks for incorrect SPD data

Make DMI data calculation fail-safe to incorrect SPD data.

Change-Id: Ica92850cc77e1f7cbf3e7e44717de42a03b93bbe
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Reviewed-on: https://review.coreboot.org/20839
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
3 files changed