Activate older Xeon P4 microcodes

Activate older Xeon P4 microcodes

As new microcode files were included, the table was not updated with
families 0f25 and 0f26.

Change-Id: I5bb8be9d7c37eb8406dcb48a4b933eab24639bda
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/290
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>