[coreboot] New SeaBIOS feature - boot order configuration

[Kevin O'Connor]

The latest SeaBIOS git now has a feature which permits one to
configure the default boot order via a CBFS file.  This feature was
added for QEMU, but it was done in such a way that Coreboot users can
benefit as well.

To use the feature, see the documentation at:

http://www.coreboot.org/SeaBIOS#Configuring_boot_order

For other information on obtaining and using SeaBIOS, see:

http://www.coreboot.org/SeaBIOS

-Kevin