Move CAR settings to board config for socket 940 boards.

Move CAR settings to board config for socket 940 boards.

For the a number of the socket 940 based machines, I collapsed their CAR
configurations into the socket config.

However, I have kept a number of overrides in place for the following
machines:
* broadcom/blast
* ibm/e32{5,6}
* newisys/khepri
* sunw/ultra40
* tyan/s488{0,2}

These machines used different setting than the defaults for socket 940
systems.

Signed-off-by: Warren Turkal <wt@penguintechs.org>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5883 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1