Intel cpus: Include CAR from socket

Intel cpus: Include CAR from socket

It was not obvious which CAR was compiled in. Also build would fail
if a socket included two models with both having an include for CAR.

Change-Id: I000c2e24807c3d99347a43d120333c13fbf91af4
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/626
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>