put our configs upstream

[merge]

in order for our configs to get (more) build-testings, we could add them to coreboot's configs directory. That would be trivial for our "free" config. What about the other one, that depends on the vbios option rom blob that is not included in the blobs repo?

[merge]

note from nico:

The options to run OpROMs are independent from those that add binaries. This simple config works for instance:

CONFIG_VENDOR_ESD=y
CONFIG_PCI_OPTION_ROM_RUN_YABEL=y

Nico